KIROMIC BIOPHARMA, INC.
(Exact name of registrant as specified in its charter)

7707 Fannin, Suite 140
Houston, TX 77054
(832) 968-4888
(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

Maurizio Chiriva Internati, DBSc., Ph.Ds.
Chief Executive Officer
7707 Fannin, Suite 140
Houston, TX 77054
(832) 968-4888
(Names, address, including zip code, and telephone number, including area code, of agent for service)

Approximate date of commencement of proposed sale to public:
From time to time after this Registration Statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. o

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided to Section 7(a)(2)(B) of the Securities Act. o

The registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information contained in this preliminary prospectus is not complete and may be changed. These securities may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

This is a firm commitment initial public offering of shares of common stock of Kiromic BioPharma, Inc. Prior to this offering, there has been no public market for our common stock. We anticipate that the initial public offering price of our shares will be between $12.00 and $14.00.

We have applied to list our common stock on the Nasdaq Capital Market under the symbol "KRBP."

We are an "emerging growth company" under the federal securities laws and have elected to comply with certain reduced public company reporting requirements.

Investing in our common stock involves a high degree of risk. See "Risk Factors" beginning on page 30.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

We have granted a 45-day option to the representative of the underwriters to purchase up to additional shares of common stock solely to cover over-allotments, if any.

You should rely only on the information contained in this prospectus or in any amended prospectus that we may authorize to be delivered or made available to you. We and the underwriter have not authorized anyone to provide you with different information. We are offering to sell, and seeking offers to buy, shares of our common stock only in jurisdictions where such offers and sales are permitted. The information in this prospectus is accurate only as of the date of this prospectus, regardless of the time of its delivery or any sale of shares of our common stock.

Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the shares of our common stock and the distribution of the prospectus outside the United States. See "Underwriting."

PROSPECTUS SUMMARY

This summary highlights information that we present more fully in the rest of this prospectus. This summary does not contain all of the information you should consider before buying our shares in this offering. This summary contains forward-looking statements that involve risks and uncertainties, such as statements about our plans, objectives, expectations, assumptions or future events. These statements involve estimates, assumptions, known and unknown risks, uncertainties and other factors that could cause actual results to differ materially from any future results, performances or achievements expressed or implied by the forward-looking statements. See "Special Note Regarding Forward-Looking Statements." You should read the entire prospectus carefully, including the "Risk Factors" section and the financial statements and the notes to those statements.

THE COMPANY

Overview

Revolutionizing Next-Gen Allogenic CAR Therapies for Solid Tumors.

We are a target discovery and gene-editing company utilizing artificial intelligence and our proprietary neural network platform with a therapeutic focus on immuno-oncology.

Our proprietary target discovery engine is called "Diamond."

Kiromic's Diamond is big data science meeting target identification, dramatically compressing man-years and billions of drug development dollars to develop a live drug.

Without Kiromic's Diamond, the management of all the data required to solve the Target Identification puzzle is both challenging and inefficient. Normal data required for target identification would require manual analysis of thousands of cancer tissue samples with billions of data points, looking at millions of mutations, and poring over thousands of publications on oncology and targets.

Diamond (Screening, Prioritizing, and Harmonizing)

Diamond is a computational platform and a neural network that can identify new cancer immunological targets for T cells and B cells. Diamond is an artificial intelligence and machine learning approach that can identify novel surface tumor targets. It uses public and proprietary samples and can expand into the tumor target space.

Diamond addresses the main challenges in today's clinical pipeline: target identification.

Diamond generates a prioritized list of cancer immunological targets for T cells and B cells. These targets can be used to create therapies such as antibody therapies, T cell therapies, T cell receptor therapies, CAR-T cell therapies and vaccine therapies.

Diamond's cognitive and deep learning capabilities extract information from our extensive digital library consisting of clinical studies, genomic and proteomic datasets. Diamond harmonizes all the raw data and creates datasets, which allows us to screen for cancer targets. Diamond will identify and prioritize lists of genes (biomarkers, wild type, mutant, isoform, neoepitope, etc.) that are highly and specifically expressed in the disease of interest while providing its distribution and methylation status across the entire patient population. It also maps out the exact portion of the gene that will elicit an immune response.

Diamond performs meta-analysis and convolution studies while standardizing and normalizing data across multiple and variable experimental platforms, then allows for the visualization of consistent and accurate results in a user-friendly fashion.

Prioritizing T and B Cell Targets. Diamond generates a prioritized list of immunological targets for T cells and B cells. These targets can be used to create therapies such as antibody therapies, T cell therapies, T cell receptor therapies, CAR T cell therapies and vaccine therapies.

Identify Highly Expressed Genes. Diamond's cognitive and deep learning capabilities extract information from our extensive digital library consisting of clinical studies, genomic and proteomic datasets. Diamond harmonizes all the raw data and creates datasets which allows us to screen for cancer targets. Diamond will identify and prioritize lists of genes (biomarkers, wild type, mutant, isoform, neoepitope, etc.) that are highly and specifically expressed in the disease of interest while providing its distribution status across the entire patient population. It also maps out the exact portion of the gene that will elicit an immune response.

Performs Meta Analysis. Diamond performs meta-analysis and convolution studies while standardizing and normalizing data across multiple and variable experimental platforms, then allows for the visualization of consistent and accurate results in a user-friendly fashion.

Predict Isoform Targets. Cancer cells will down regulate or shed targets in order to avoid detection and destruction by T cells (the immune system). These variations are known as isoforms. CancerSplice also shows a box plot by tissue of expression of the isoform in normal cancer genome atlas tissues and a box plot of the matching isoform in genotype-tissue expression program normal data. The sequence of amino acids that are specific for the selected cancer isoforms are then directly fed to Diamond's artificial neural capsule network for peptide design and prioritization.

CancerSplice (Isoform Target Prediction)

Cancer cells will down-regulate or shed targets in order to avoid detection and destruction by T cells (the immune system). One mechanism for this tumor defense is the selection for alternative splice forms of target proteins. These variations are known as isoforms. Target isoforms include variations in their primary amino acid sequence that can change both the final folded form of the target plus their ability to be recognized by pre-existing and modified T cells. Within a heterogeneous cancer cell population, isoforms can preferentially expand to avoid detection and destruction by T cells. These

isoforms can make it impossible for T cells to outright bind the targets on cancer cells. No binding to the target means no killing of cancer cells.

To solve the problem of identifying shared, common cancer-specific antigens derived from alternative splicing and cancer-specific isoform formation, we have developed a fully integrated in silico methodology to predict cancer-specific isoforms called CancerSplice.

CancerSplice allows for the prediction and prioritization of iso-antigens which could serve as a novel source of tumor targets, highly specific for neoplastic cells but without the drawback of also being highly patient-specific.

CancerSplice allows the user to select a tissue type from the cancer genome atlas along with thresholds for filtering isoforms (minimum and maximum tumor and normal cell transcript parts per million). Based on the tissue selected, CancerSplice displays a sorted list of isoforms that are elevated in high-expressing tumors versus normal tissues which have low expression. Differential analysis is then performed and used to generate two types of lists: (1) isoforms expressed in tumor but not expressed in normal tissues; and (2) isoforms expressed in normal tissues but yet at a much higher level in tumors. CancerSplice then allows the user to click on an isoform in the list to select a specific isoform to display in a detailed panel, which shows the multi-sequence alignment for the isoform, as well as all the other isoforms of that gene.

Finally, CancerSplice also shows a box plot by tissue of expression of the isoform in normal cancer genome atlas tissues and a box plot of the matching isoform in genotype-tissue expression program normal data. The sequence of amino acids that are specific for the selected cancer isoforms are then

directly fed to Diamond's artificial neural capsule network for peptide design and prioritization. Therefore, we believe that we have developed unique tools to address the issue with tumor-specific iso-antigens through CancerSplice and Diamond.

Target isoforms are protein variants of the same targets that occur during the normal processing of immature gene transcripts to the mature form.

Target isoforms include variations in their primary amino acid sequence that can change both the final folded form of the target plus their ability to be recognized by modified T cells (autologous/allogeneic) and other cells, such as NK or invariant NKT cells (often used in the allogeneic setting).

If they are the predominate form on the cell surface, these isoforms can make it impossible for T cells to outright bind the targets on cancer cells.

No binding or insufficient binding to the isoform results in no killing of cancer cells.

Our CancerSplice accurately predicts the most appropriate isoforms for T cells to bind and destroy cancer cells.

Immune Therapies Using Our Artificial Intelligence Selected Targets

With our artificial intelligence (Diamond), we seek to use our targets to train immune cells. The trained immune cells generate a therapeutic immune response in patients. These peptide sequences, known as tumor-specific iso-antigens, generate an immunological response and therefore eradicate cancer cells.

We are developing our brand of CAR cell product candidates known as ALEXIS (Allogenic Lead Exogenous Isoforms). These are designed to treat cancer by capitalizing on the immune system's ability to destroy cancer cells. These products are in the pre-IND stage of the FDA clinical trial process. We are currently going through the validation process and expect that IND enabling studies will commence in the second half of 2020.

large B cell lymphoma, respectively. Autologous CAR-T cell therapies are manufactured individually for the patient's use by modifying the patient's own T cells outside the body, causing the T cells to express CARs. The entire manufacturing process is dependent on the viability of each patient's T cells and takes approximately three to four weeks. Allogenic T cell therapies involve engineering healthy donor T cells, which we believe will allow for the creation of an inventory of off-the-shelf products that can be delivered to a larger portion of eligible patients throughout the world.

We have not generated any revenue from sales to date, and we continue to incur significant research and development and other expenses related to our ongoing operations. As a result, we are not and have never been profitable and have incurred losses in each period since we began principal business operations in 2012.

Engineered T Cell Therapy

White blood cells are a component of the immune system and are responsible for defending the body against infectious pathogens and other foreign material. T cells are a type of white blood cell and are involved in both sensing and killing infected or abnormal cells, including cancer cells, as well as coordinating the activation of other cells in an immune response.

T cells can be distinguished from other white blood cells by T cell receptors present on their cell surface. These receptors contribute to tumor surveillance by directing T cells to recognize infected and destroy cancerous cells. When T cells with cancer-specific receptors are absent, present in low numbers, of poor quality or rendered inactive by suppressive mechanisms, cancer may grow and spread. In addition, standard of care treatments, such as chemotherapy regimens, as well as disease specific factors can damage the patient's immune system, thereby inhibiting the ability of T cells to kill cancer.

Engineered T cell therapy is a type of immunotherapy treatment whereby human T cells are removed from the body and engineered to express CARs which, when infused into a patient, may recognize and destroy cancer cells in a more targeted manner.

CARs are engineered molecules that, when present on the surface of a T cell, enable the T cell to recognize specific proteins or antigens that are present on the surface of other cells.

There are two primary approaches to engineered T cell therapy: autologous and allogenic. Autologous therapies use engineered T cells derived from the individual patient, while allogenic therapies use engineered T cells derived from healthy donor T cells.

The autologous approach, pioneered by Novartis, Kite and others, has been highly successful in engineering patients' immune systems to fight cancer, in particular CD19 positive cancers, resulting in significant remission rates. Autologous products are manufactured by first collecting a patient's white blood cells, through a process known as leukapheresis, separating the T cells from the patient's blood sample and proliferating the isolated T cells. After the cells have multiplied, the CAR construct is virally transduced into the T cells and the engineered T cells are then propagated until a sufficient number of cells are available for infusion into the patient. Finally, the engineered T cells are frozen, and then shipped back to the clinical center for administration to the patient. The process from leukapheresis to delivery to the clinical center takes approximately three to four weeks.

Allogenic engineered T cells are manufactured in a similar manner as autologous, but with two key differences: (1) allogenic T cells are derived from healthy donors, not cancer patients, and (2) allogenic T cells must also be genetically engineered to minimize the risk of graft-versus-host disease, a condition where allogenic T cells can recognize the patient's normal tissue as foreign and cause damage in the patient.

Our Approach

Our operating motto is Better Target, Better Life ^TM.

Our goal is to defeat cancer by developing immunotherapies that rely on improving target discovery and validation. With better targets, we believe our therapies will be more effective than the current crop of immunotherapies using older targets.

We are currently in the process of validating different tumor-specific immunotherapy product candidates for refractory CAR-T cell patients. Refractory CAR-T cell patients are those who have received CAR-T cell treatments for their indication, however, they either showed low or no benefit from this treatment. We validate biomarkers for these product candidates using the technologies and processes discussed in the sections below. The development schema below describes the path forward for developing our novel product candidates.

ABBIE (Delivery Vehicle)

ABBIE Summary

ABBIE is a novel gene-editing system for inserting therapeutic genes safely into the genome of a host cell.

ABBIE technology comprises two main components, (i) a genome template (extracted from the ALEXIS plasmid), containing the therapeutic genes needed to retrain tumor-killing cells, and (ii) the gene-editing machinery required to safely insert this template into the genome of the therapeutic cells.

The ABBIE protein accompanies the CAR-containing genome template as it passes through the cell membrane into the nucleus and guides the template-flanking sequences (the "glue") safely into the target genome.

Due to this targeting ability, ABBIE can also be used to remove unwanted, inhibitory genes. CAR expression on the Gamma-Delta T cells allows them to detect and destroy the antigen-expressing targeted cells.

The OFF switch permits fast shutdown in the event of an unexpected toxicity. Additional Anti-tumor factors can help neutralize the toxic tumor microenvironment.

ABBIE: Development

We are currently developing ABBIE (A Binding-Based Integrase Enzyme) for delivering our product candidates. ABBIE is a non-viral gene-editing mechanism to insert the target DNA template information into the T cell genome at a predetermined locus. ABBIE allows for insertion of the genome template into the T cells so that they could express the CAR protein and other accessory proteins while possibly eliminating unwanted inhibitory proteins.

The non-viral vector template is simultaneously physically comingled with the patient's T/NK cells. The non-viral vector transfers the target's genomic information into the T/NK cells, where it is integrated into the T/NK cell's genome. T/NK cells now have been reprogramed with the genomic information for targeting and can successfully identify the targets on the cancer cells. This T/NK cell therapy is infused into the patient. T/NK cells will hunt down cancer cells with the known targets and destroy these cancer cells.

We believe that this gene delivery platform will deliver the DNA template to the T/NK cell genomes at a lower cost and shorter timeframe versus a viral vector. By comparison, a retroviral vector would have a longer development lead time (~12 months) with an increased insertional mutagenesis risk. Insertional mutagenesis means that a random insertion of the DNA could activate uncontrolled cell growth. ABBIE allows for a more consistent expression and will have a shorter development lead time (3-6 months). It avoids unnecessary risks by targeting a single locus and produces more predictable cell-to-cell expressions.

The development of ABBIE involves a multi-step process, which includes preparation of an integration-deficient lentivirus, a sensitive, targeted gene knock-out assay system, optimization of an inducible ABBIE protein expression system, a powerful screen for gene targeting efficiency, and a sensitive screen of additional ABBIE mutants to further improve efficacy. Altogether, the development plan involves construction of dozens of plasmid constructs, which are complete. To date, we have successfully completed the high transduction efficiency lentivirus system for our assays along with the non-integrating lentivirus system. Optimization of the selection schema is over 70% complete and the construction of the inducible expression and knock-out systems are well underway. If no major obstacles are encountered, we expect to be able to begin producing effector cells for in vitro testing using ABBIE by December 2020.

SWITCHES

ACTIVATION Switch. A rapidly deployed activation switch can provide a survival and proliferation signal to the therapeutic cells to enhance their efficacy and persistence in vivo.

ATTENUATION Switch. A rapidly deployed attenuation switch can intercept activation signals transiently to minimize toxicity following successful anti-tumor interactions. Choice of two non-mutually exclusive Attenuation Switch approaches: (a) a protein-based switch that rapidly triggers attenuation of target cells in a dose-dependent fashion. (b) a small molecule-based approach to rapidly and reversibly attenuate cell signaling.

SAFETY Switch. A rapidly deployed, protein-based safety switch can eliminate therapeutic cells in case of acute toxicity. The safety switch is designed to eliminate either: (a) essentially all active therapeutic cells. (b) only the most active cells, preserving a cohort of backup therapeutic cells for long-term control of residual relapsing tumor cells. The Safety Switch will be co-expressed along with the bioactive chimeric activation receptor (CAR), the Activation Switch, and the Attenuation Switch.

Manufacturing Allogeneic Effector Cells

The three primary steps to creating our engineered effector cells are: (1) collection, (2) gene editing, and (3) purification, formulation, and storage.

PD-1: Avoiding Antigen Escape

To further boost the potency of our effector cells, we plan to explore an additional targeting element that interferes with the inhibitory "checkpoint" protein, PD-1 found on most activated T cells and other effector cells. By interacting with the PD-L1 and PD-L2 inhibitory ligands often found at high levels within the tumor microenvironment, PD-1 normally sends a suppressive signal to the cell to shut down its activity in a process known as exhaustion. However, using a "flipped" signaling receptor, we plan to turn PD-1 "inside-out," changing this inhibitory signal to a stimulatory signal. Thus, with two ways to activate the anti-tumor cells, the chances for the tumor to escape treatment are greatly reduced.

The chPD1 Receptor is activated by engagement with PD-L1+ or PD-L2+ tumors.

Checkpoint inhibitors block PD-1 and PD-L1.

Our chPD-1 (chimeric PD-1) takes it one step further by converting PD-1 and PD-L1 from an inhibitory signal to an activation signal. This pivotal CAR transformation allows our CAR T-cells to then kill solid tumors and TME (tumor micro environment).

chPD1-expressing T cells can efficiently lyse both hematologic and solid tumors expressing PD-L1 and/or PD-L2, leading to greatly improved survival with minimal toxicity in animal models.

chPD1 Receptor signaling also leads to cytokine release that can have widespread anti-tumor effects in the tumor microenvironment.

Step 1. Collection

The starting material for our engineered T/NK cell products is white blood cells. For our allogenic products, the T/NK cells are collected from a healthy donor. These are collected using a standard blood bank procedure known as leukapheresis. The collected cells are then sent to a central processing facility, where the peripheral blood mononuclear cells, including T/NK cells, are isolated from the other sample components. The T/NK cells for our allogenic products are isolated and stored frozen, creating an inventory of starting healthy donor cells for manufacturing.

Step 2. Gene Editing

These cells are stimulated to proliferate, then transduced with a non-replicating retroviral vector to introduce the CAR gene into the patient's T/NK cells.

We are also currently developing ABBIE, which is a non-viral gene-editing mechanism to insert the target DNA template information into the T/NK cell genome. The CAR sequence will direct the expression of CAR proteins on the cell surface that allows the transduced T/NK cells to recognize and bind to a target molecule that is present on cancer cells.

Step 3. Purification, Formulation, and Storage

These engineered cells are then propagated in cell culture bags until sufficient cells are available. The engineered T/NK cells are then washed and frozen at the cell processing site.

For our allogenic products, the engineered cells are frozen and sent to long-term storage in the vapor phase of liquid nitrogen. This inventory will be securely stored and then shipped to oncology centers as needed.

Our Product Pipeline and Development

Using our proprietary technologies, we are researching and developing multiple product candidates for the treatment of blood cancers and solid tumors. Our product candidates are allogenic engineered cells to be used for specific patients or as off-the-shelf treatments for any patient with a particular cancer type. Each product candidate targets a selected antigen expressed on tumor cells and bears specific engineered attributes.

In the near term, we are progressing multiple product candidates directed at promising targets for blood cancers, including refractory large B cell lymphoma, and targets associated with solid tumors, such as malignant pleural mesothelioma (lung) and epithelial ovarian cancer.

Our product pipeline and clinical program projected timelines (clinical timelines and final patient accrual numbers are predicated upon FDA review and will be modified in accordance to FDA particular requirements) are represented in the diagrams below:

ALEXIS Iso Mesothelin EOC

ALEXIS Iso Mesothelin is our allogenic CAR cell product candidate targeting Iso Mesothelin.

ALEXIS Iso Mesothelin represents an innovative approach for stage III to stage IV platinum resistant epithelial ovarian cancer and involves the use of CAR effector cells.

Target Indications

ALEXIS Iso Mesothelin targets epithelial ovarian cancer, or EOC. According to the American Cancer Society, approximately 21,750 individuals are diagnosed with EOC in the U.S. each year, and 300,000 worldwide.

EOC generally affects elderly women over 60 years old. Genetic mutations and/or a family history of ovarian/breast/colorectal cancer increase the risk of EOC. EOC can metastasize to abdominal peritoneum, which is extremely difficult to treat. The median life expectancy after local recurrence is approximately 15 months.

In total, the standard treatment can cost approximately $100,000. Ovarian cancer is a deadly disease with stage IV patients having a 5-year overall survival rate of only 30%.

Out of 21,750 U.S. patients who are initially diagnosed with EOC each year, we believe that up to 15,400 (70%) will potentially be eligible for our CAR cell therapy.

In 2018, this market size reached $1.2 billion according to Grand View Research (July 2019).

This market is expected to grow at 6.2% annually compounded from 2019 to 2026 according to Data Monitor Healthcare.

Development Plan

ALEXIS Iso Mesothelin will be studied in a Phase 1 clinical trial for EOC patients. We plan to submit an IND in Q4 2020. We will be the sponsor of the clinical trials, which will be conducted by industry-

standard CROs and the trials will be conducted by leading academic institutions and experienced research facilities in the U.S. and Western Europe.

The Phase 1 trial is expected to be an open-label, single arm, multi-center, dose-escalation, safety, pharmacokinetic and pharmacodynamic clinical trial in adult patients with platinum resistant EOC.

The primary goal will be to assess safety and tolerability at increasing dose levels in order to estimate the maximum tolerated and efficacious dose.

Prior to treatment, all patients are expected to undergo selected screening process to assure that they meet all the corresponding inclusion and exclusion criteria, and are expressing our intended target (Iso Mesothelin).

To further boost the potency of our effector cells, we plan to also explore an additional targeting element that interferes with the inhibitory "checkpoint" protein, PD-1 found on most activated T cells and other effector cells. By interacting with the PD-L1 and PD-L2 inhibitory ligands often found at high levels within the tumor microenvironment, PD-1 normally sends a suppressive signal to the cell to shut down its activity in a process known as exhaustion. However, using a "flipped" signaling receptor, we plan to turn PD-1 "inside-out," changing this inhibitory signal to a stimulatory signal. Thus, with two ways to activate the anti-tumor cells, we believe the chances for the tumor to escape treatment are greatly reduced.

Consequently, we plan to also submit a Phase 1 IND for our PD-1 gamma delta reverse switch CAR T-cells for EOC in Q4 2020, followed by the submission of an IND for a Phase 1 combination PD-1/IsoMesothelin CAR clinical trial in Q3 2021.

ALEXIS Iso Mesothelin MPM

ALEXIS Iso Mesothelin MPM is our allogenic effector cell product candidate targeting Iso Mesothelin.

ALEXIS Iso Mesothelin MPM represents an innovative approach for malignant pleural mesothelioma and involves the use of CAR effector cells.

Target Indications

ALEXIS Iso Mesothelin MPM targets malignant pleural mesothelioma, or MPM. Mesothelioma is a disease in which malignant (cancer) cells form in the thin layer of tissue that covers organs typically in the chest or abdomen. Pleura refers to the thin layer of tissue that lines the chest cavity and covers the lungs. The tumors often spread over the surface of organs often without spreading into the organ. They may spread to nearby lymph nodes or in other parts of the body. Malignant mesothelioma may also form in the testicles or heart, but this is rare.

According to the American Cancer Society, approximately 3,000 individuals are diagnosed with MPM in the U.S. each year, and 43,000 deaths globally each year.

MPM rates are high in the military, particularly for those involved in ship building, construction, mechanics, and insulation/textile production and installation. Due to these higher rates, corporations have set aside approximately $30 billion each year to settle job-related asbestos MPM for their personnel.

The standard treatment for MPM involves chemotherapy that costs approximately $90,000, surgery that costs approximately $20,000 - $30,000, and radiation that costs approximately $10,000 - $50,000. In total, the standard treatment can cost up to $170,000. Approximately 80% of patients undergoing this treatment will eventually relapse. The average life expectancy after refractory is approximately 7 months.

Out of the 3,000 U.S. patients who are initially diagnosed with MPM each year, we believe that approximately 2,400 (80%) will eventually be eligible for our effector cell therapy.

Mesothelioma statistics show there are about 3,000 new cases of mesothelioma diagnosed in the United States each year. According to the most recent data, 57,657 mesothelioma cases were reported between 1999 and 2016. Between 1999 and 2017, there were more than 47,600 mesothelioma-related deaths. Pleural mesothelioma is the most common form, accounting for 80 - 90% of all cases. (Source: https://www.mesothelioma.com/mesothelioma/statistics/)

Driscoll et al. estimated that as many as 43,000 people worldwide die from the disease each year. It has also been estimated that there are around 10,000 mesothelioma cases annually in Australia, Japan, North America and western Europe combined. (Source: See Bulletin of the Delgermaa et. al, World Health Organization 2011;89:716-724C.)

This market is expected to grow at 7.60% annually compounded from 2020 to 2026 according to MarketWatch (April 2, 2020).

This market size is expected to reach $300 million by 2025 according to Persistent Market Research (July 2017).

Development Plan

ALEXIS Iso Mesothelin MPM will be studied in a Phase 1 clinical trial for pleural mesothelioma. We plan to submit an IND in 2021, and the subsequent clinical trial will be conducted by leading academic institutions and experienced research facilities in the U.S. and Western Europe.

The Phase 1 trial is expected to be an open label, single arm, multi-center, dose escalation, safety, pharmacokinetic and pharmacodynamic clinical trial in adult patients with mesothelioma, who are relapsed/refractory to maximal surgical reduction and standard of care chemotherapy +/– radiation therapy.

The primary goal will be to assess safety and tolerability at increasing dose levels in order to estimate the maximum tolerated and efficacious dose.

Prior to treatment, all patients are expected to undergo selected screening process to assure that all the patients meet all the corresponding inclusion and exclusion criteria and express our intended target IsoMesothelin.

To further boost the potency of our effector cells, we also plan to explore an additional targeting element that interferes with the inhibitory "checkpoint" protein, PD-1 found on most activated T cells and other effector cells. By interacting with the PD-L1 and PD-L2 inhibitory ligands often found at high levels within the tumor microenvironment, PD-1 normally sends a suppressive signal to the cell to shut down its activity in a process known as exhaustion. However, using a "flipped" signaling receptor, we plan to turn PD-1 "inside-out," changing this inhibitory signal to a stimulatory signal. Thus, with two ways to activate the anti-tumor cells, we believe the chances for the tumor to escape treatment are greatly reduced.

Utilizing the data accrued from the prior Phase 1 combination PD-1/Iso-Mesothelin CAR T-cell trial for EOC, we plan to subsequently submit a Phase 1 combination IND for our PD-1/IsoMesothelin CAR T-cells for MPM in Q3 2021.

ALEXIS AIDT-1

ALEXIS AIDT-1 is our allogenic CAR cell product candidate targeting AIDT-1. This product is currently undergoing pre-IND studies. Following subsequent IND-enabling studies, we will be applying for an IND with the FDA in 2022.

ALEXIS AIDT-1 targets AIDT-1, an antigen expressed on the surface of B cells, including malignant B cells. The product represents an innovative approach for relapsed hematologic malignancies such as B cell acute lymphoblastic leukemia and for diffuse large B cell lymphoma and involves the use of adoptive T cells expressing CARs against AIDT-1. We expect our strategy to target B cell malignancies that have become refractory to currently available therapies.

Target Indications

ALEXIS AIDT-1 targets NHL (ie, diffuse large B cell lymphoma, or DLBCL). According to the American Cancer Society, approximately 25,000 - 30,000 individuals are diagnosed with DLBCL in the U.S. each year, and 200,000 worldwide. The growth rate for DLBCL is relatively stable.

The standard treatment is R-CHOP chemotherapy, which is a combination treatment consisting of five separate drugs: rituximab (Rituxan), cyclophosphamide, doxorubicin hydrochloride, vincristine (Oncovin), and prednisolone. R-CHOP chemotherapy costs approximately $100,000 per year. Average life expectancy following the failure of R-CHOP chemotherapy is approximately 6 months.

The failure rate for R-CHOP chemotherapy is 30 - 50%. Up to 50% of failures cannot get stem cell transplants and are potential candidates for CAR therapy. Standard CAR-T therapy costs between approximately $375,000 to $475,000.

Out of the 30,000 U.S. patients who are initially diagnosed with DLBCL each year, we believe that approximately 3,000 will eventually be eligible for our CAR-T cell therapy.

Worldwide number of patients for Non-Hodgkin's Lymphoma is estimated at 509,590. (Source: Global cancer statistics 2018: Globocan estimates of incidence & mortality world-wide for 36 cancers in 185 countries) with 77,240 cases in the U.S. in 2020 according to the American Cancer Society 2020).

The number of diagnosed hematologic cases is expected to grow at 10.5% annually compounded according to Data Monitor Healthcare (Source: See Hematologic Malignancies Market Size, Share & Trends Analysis Report by Type (Leukemia, Lymphoma, Multiple Myeloma), By Therapy (Chemotherapy, Radiotherapy, Immunotherapy), And Segment Forecasts, 2018 - 2025.)

The market size for hematologic cancers is expected to reach $4.6 billion by 2025 according to BIS Research (November 21, 2019).

Development Plan

ALEXIS AIDT-1 will be studied in a Phase 1 clinical trial for DLBCL, primary mediastinal B cell lymphoma, and transformed follicular lymphoma. We plan to submit an IND in 2022, and the clinical trial will be conducted by leading academic institutions and experienced research facilities in the U.S. and Western Europe.

The Phase 1 trial is expected to be an open-label, single-arm, multi-center, dose escalation, safety, pharmacokinetic and pharmacodynamic clinical trial in adult patients with DLBCL, who are relapsed or refractory to prior treatment with an anti-CD20 monoclonal antibody therapy and an anthracycline containing chemotherapy and/or an autologous stem cell transplant.

The primary endpoint will be to assess safety and tolerability at increasing dose levels in order to estimate the maximum tolerated and efficacious dose.

Prior to treatment, all patients are expected to undergo selected screening process to assure than the patients are expressing our intended target (AIDT-1) and meet all corresponding inclusion and exclusion criteria.

and other effector cells. By interacting with the PD-L1 and PD-L2 inhibitory ligands often found at high levels within the tumor microenvironment, PD-1 normally sends a suppressive signal to the cell to shut down its activity in a process known as exhaustion. However, using a "flipped" signaling receptor, we plan to turn PD-1 "inside-out," changing this inhibitory signal to a stimulatory signal. Thus, with two ways to activate the anti-tumor cells, we believe the chances for the tumor to escape treatment are greatly reduced.

Utilizing the data accrued from the prior Phase 1 combination PD-1/Iso-Mesothelin CAR T-cell trial for EOC and MPM, we plan to subsequently submit a Phase 1 combination IND for our PD-1/IsoMesothelin CAR T-cells for a to be determined pre-clinically validated hematologic malignancy in Q3 2022.

Our Risks and Challenges

Our prospects should be considered in light of the risks, uncertainties, expenses and difficulties frequently encountered by similar companies. Our ability to realize our business objectives and execute our strategies is subject to risks and uncertainties, including, among others, the following:

•: We have never been profitable and may never achieve or maintain profitability.
•: If we are unable to raise substantial additional capital on acceptable terms, or at all, we may be forced to delay, reduce or eliminate some or all of our research programs, product development activities and commercialization efforts.
•: We have a limited operating history, which makes it difficult to evaluate our current business and future prospects and may increase the risk of your investment.
•: Our business is dependent on the successful development, regulatory approval and commercialization of our personalized immunotherapy product candidates, which are in the early stages of development and have not been tested in humans.
•: Our tumor-specific cancer immunotherapy approach is based on novel ideas and technologies that are unproven and may not result in marketable products, which exposes us to unforeseen risks and makes it difficult for us to predict the time and cost of product development and potential for regulatory approval.

•: We may be required to perform additional or unanticipated clinical trials to obtain approval or be subject to post-marketing testing requirements to maintain regulatory approval. If our immunotherapy candidates prove to be ineffective, unsafe or commercially unviable, our entire technology platform and pipeline would have little, if any, value, which would have a material and adverse effect on our business, financial condition, results of operations and prospects.
•: The genome editing field is relatively new and evolving rapidly, and other existing or future technologies may provide significant advantages over our Diamond, CancerSplice and ABBIE technologies, which could materially harm our business.
•: If our product candidates do not achieve projected development milestones or commercialization in the announced or expected timeframes, the further development or commercialization of such product candidates may be delayed, and our business will be harmed.
•: Product liability lawsuits against us could cause us to incur substantial liabilities and could limit commercialization of any products that we develop alone or with collaborators. We plan to enter into significant arrangements with collaborators and expect to depend on collaborations with third parties for certain research, development and commercialization activities, and if any such collaborations are not successful, it may harm our business and prospects.
•: We plan to enter into significant arrangements with collaborators and expect to depend on collaborations with third parties for certain research, development and commercialization activities, and if any such collaborations are not successful, it may harm our business and prospects.
•: We expect to rely on third parties to conduct, supervise and monitor our clinical trials and some aspects of our research and preclinical testing, and if those third parties do not successfully carry out their contractual duties, comply with regulatory requirements, or otherwise perform in a satisfactory manner, we may not be able to obtain regulatory approval or commercialize product candidates, or such approval or commercialization may be delayed, and our business may be substantially harmed.
•: We may rely on third parties for the manufacturing process of product candidates, and failure by those parties to adequately perform their obligations could harm our business.
•: The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates.
•: We expect the product candidates we develop will be regulated as biological products, or biologics, and therefore they may be subject to competition sooner than anticipated.
•: Coverage and reimbursement may be limited or unavailable in certain market segments for our product candidates, which could make it difficult for us to sell our product candidates, if approved, profitably.
•: The advancement of healthcare reform may negatively impact our ability to sell our product candidates, if approved, profitably.
•: Our ability to compete effectively in our markets may decline if we do not adequately protect our patents and proprietary rights, and our patents and proprietary rights do not necessarily address all potential threats to our competitive advantage.

In addition, we face other risks and uncertainties that may materially affect our business prospects, financial condition, and results of operations. You should consider the risks discussed in "Risk Factors" and elsewhere in this prospectus before investing in our common stock.

Our Corporate History

We were first organized as a corporation in the State of Texas on August 6, 2006 under the name "Kiromic, Inc." Between 2006 and 2012, we had minimal operations. On March 15, 2013, we converted to a limited liability company in the State of Texas under the name "Kiromic, LLC." On May 27, 2016, we converted to a corporation in the State of Delaware under the name "Kiromic, Inc." On December 16, 2019, we changed our name to "Kiromic BioPharma, Inc."

We have one wholly-owned subsidiary, GreenPlanet Pharma, Inc., which was incorporated in the State of Delaware on November 26, 2018. GreenPlanet Pharma, Inc., operates an oral healthcare business. It has developed a mouthwash using a high quality, safe, and natural ingredient formulation to provide effective symptomatic relief for a wide range of oral irritations and health concerns. This subsidiary has not generated any revenues.

Corporate Information

Our principal executive office is 7707 Fannin, Suite 140, Houston, TX 77054. Our telephone number is (832) 968-4888. Our website is www.kiromic.com. The information contained on our website is not a part of this prospectus, nor is such content incorporated by reference herein, and should not be relied upon in determining whether to make an investment in our common stock.

Implications of Being an Emerging Growth Company

Upon the completion of this offering, we will qualify as an "emerging growth company" under Jumpstart Our Business Act of 2012, as amended, or the JOBS Act. As a result, we will be permitted to, and intend to, rely on exemptions from certain disclosure requirements. For so long as we are an emerging growth company, we will not be required to:

•: have an auditor report on our internal controls over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act;
•: comply with any requirement that may be adopted by the Public Company Accounting Oversight Board regarding mandatory audit firm rotation or a supplement to the auditor's report providing additional information about the audit and the financial statements (i.e., an auditor discussion and analysis);
•: submit certain executive compensation matters to stockholder advisory votes, such as "say-on-pay" and "say-on-frequency;" and
•: disclose certain executive compensation related items such as the correlation between executive compensation and performance and comparisons of the chief executive officer's compensation to median employee compensation.

In addition, Section 107 of the JOBS Act also provides that an emerging growth company can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act of 1933, as amended, or the Securities Act, for complying with new or revised accounting standards. In other words, an emerging growth company can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected to take advantage of the benefits of this extended transition period. Our financial statements may therefore not be comparable to those of companies that comply with such new or revised accounting standards.

We will remain an emerging growth company for up to five years from the date of the first sale of equity securities pursuant to an effective registration statement, or until the earliest of (i) the last day of the first fiscal year in which our total annual gross revenues exceed $1.07 billion, (ii) the date that we become a "large accelerated filer" as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, which would occur if the market value of our common stock

that is held by non-affiliates exceeds $700 million as of the last business day of our most recently completed second fiscal quarter or (iii) the date on which we have issued more than $1 billion in non-convertible debt during the preceding three year period.

Reverse Stock Splits

On December 17, 2019, we completed a 1-for-10 reverse stock split of our outstanding common stock. As a result of this stock split, our issued and outstanding common stock decreased from 100,060,000 to shares 10,006,005 shares.

On June 17, 2020, we completed a 1-for-3.494 reverse stock split of our outstanding common stock. As a result of this stock split, our issued and outstanding common stock decreased from 14,909,663 to 4,267,269 shares. Accordingly, unless otherwise noted, all share and per share information contained in this prospectus has been recast to retroactively show the effect of these stock splits.

THE OFFERING


Common stock offered by us		1,923,100 shares of common stock, $0.001 par value per share.
Assumed initial public offering price		$13.00 per share, the midpoint of the range set forth on the cover page of this prospectus.
Over-allotment option		The underwriters have an option for a period of 45 days to acquire up to an additional 288,465 shares of common stock from us at the public offering price, less the underwriting discount, solely for the purpose of covering over-allotments, if any.
Shares of common stock outstanding before this offering(1)		4,989,269 shares of common stock.
Shares outstanding after this offering		8,006,099 shares of common stock (or 8,294,564 shares of common stock if the underwriters exercise their over-allotment option in full), after the sale of 1,923,100 shares in this offering and after the Preferred Stock Automatic Conversions.
Use of proceeds		We estimate that we will receive net proceeds of approximately $21,963,000 (or approximately $25,394,300 if the underwriters exercise their over-allotment option in full) from the sale of common stock by us in this offering assuming an initial public offering price of $13.00 per share (the midpoint of the price range set forth on the cover of this prospectus).
		We plan to use the net proceeds of this offering primarily for clinical trials for our ALEXIS Isoform Mesothelin EOC and PD-1 product candidates, intellectual property protection and reinforcement, IND applications and IND enabling trials and working capital and general corporate purposes. The details of our plans are set forth in the "Use of Proceeds" section
Risk factors		Investing in our common stock involves a high degree of risk and purchasers of our common stock may lose part or all of their investment. See "Risk Factors" for a discussion of factors you should carefully consider before deciding to invest in our common stock.
Proposed trading market and symbol		We have applied to list our common stock for trading on the Nasdaq Capital Market under the symbol "KRBP." No assurance can be given that our application will be approved.

(1)

The number of shares outstanding is based on shares outstanding as of August 24, 2020 and excludes the following:

•: 623,319 shares of our common stock issuable upon the exercise of outstanding options with a weighted-average exercise price of $11.67 per share;
•: 946,245 shares of our common stock issuable upon the vesting of restricted stock units with a weighted-average grant date fair value of $14.21 per share;
•: 21,822,301 shares of Series A-1 Preferred Stock and 16,391,397 shares of Series B Preferred Stock which is automatically convertible into 624,594 and 469,136 shares of common stock, respectively, upon the closing of this offering (the "Preferred Stock Automatic Conversions");
•: up to an additional 137,332 shares of our common stock issuable under our 2017 Equity Incentive Plan; and

SUMMARY FINANCIAL INFORMATION

The following tables summarize our consolidated financial data. We have derived the summary consolidated statement of operations data for the years ended December 31, 2019 and 2018 and the balance sheet data as of December 31, 2019 from our audited consolidated financial statements included elsewhere in this prospectus. The interim condensed consolidated statements of operations data for the six months ended June 30, 2020 and 2019 and interim condensed consolidated balance sheet data as of June 30, 2020 are derived from our unaudited interim condensed consolidated financial statements included elsewhere in this prospectus. Such information should be read in conjunction with our financial statements and related notes included elsewhere in the prospectus and the information contained in "Management's Discussion and Analysis of Financial Condition and Results of Operations" below.

Our financial statements are prepared and presented in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. Our historical results for any period are not necessarily indicative of our future performance.

	Years Ended December 31,						Six Months Ended June 30

	2019			2018			2020			2019
Statements of Operations Data
Operating expenses:
Research and development	$	1,201,700		$	1,424,900		$	2,300,400		$	329,400
General and administrative		2,503,700			1,757,700			10,919,200			326,900
Total operating expenses		3,705,400			3,182,600			13,219,600			656,300
Loss from operations		(3,705,400	)		(3,182,600	)		(13,219,600	)		(656,300	)
Other expense		(22,500	)		(633,100	)		—			(15,000	)
Net loss	$	(3,727,900	)	$	(3,815,700	)	$	(13,219,600	)		(671,300	)
Net loss per share—basic and diluted	$	(1.39	)	$	(1.33	)	$	(4.52	)	$	(0.23	)

	June 30, 2020

	Actual		As adjusted(1)
Balance Sheet Data
Cash and cash equivalents	$	1,683,500	$	25,771,500
Working capital		744,200		24,832,200
Total assets		3,881,600		27,969,600
Total liabilities		1,786,300		1,786,300
Total stockholders' equity		2,095,300		26,183,300

(1): Gives effect on an as adjusted basis to (i) the Preferred Stock Automatic Conversions and (ii) the sale and issuance by us of 1,923,100 shares of common stock in this offering at the assumed initial public offering price of $13.00 per share (the midpoint of the range set forth on the cover page of this prospectus), after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The shares being offered by us are highly speculative in nature, involve a high degree of risk and should be purchased only by persons who can afford to lose the entire amount invested. Before purchasing any of our shares, you should carefully consider the following factors relating to our business and prospects. If any of the following risks actually occurs, our business, financial condition or operating results will suffer, the trading price of our stock could decline, and you may lose all or part of your investment.

We have never been profitable and may never achieve or maintain profitability.

We have not commercialized any products and have yet to generate any revenue from product sales. The amount of our future net losses will depend, in part, on our expenses and our ability to generate revenues. Our current and future product candidates will require substantial additional development time and resources before we may realize revenue from product sales, if at all. We expect to continue to incur significant expenses and operating losses for the foreseeable future. We anticipate that our expenses will increase substantially if and as we:

No clinical studies have begun on any of our new therapeutic product candidates, and it will be several years, if ever, before we obtain regulatory approval for a therapeutic product candidate, at which time any revenues for such product candidate will depend upon many factors, including, market conditions, costs and effectiveness of manufacturing, sales, marketing and distribution operations related to such product candidate, and the terms of any collaboration or other strategic arrangement we may have with respect to such product candidate and levels of reimbursement from third-party payors.

If we are unable to develop and commercialize one or more product candidates either alone or with collaborators, or if revenues from any product candidate that receives marketing approval or is commercialized are insufficient, we may not achieve profitability or sustain profitability, which would have an adverse effect on the value of our common stock will be materially adversely affected.

If we are unable to raise substantial additional capital on acceptable terms, or at all, we may be forced to delay, reduce or eliminate some or all of our research programs, product development activities and commercialization efforts.

The process of identifying product candidates and conducting preclinical and clinical trials is time consuming, expensive, uncertain and takes years to complete. We expect our expenses to increase in connection with our ongoing activities, particularly as we identify, continue the research and development of, initiate clinical or field trials of, and seek marketing approval for, product candidates. In addition, if any therapeutic product candidate that we develop alone or with collaborators obtains marketing approval, we may incur significant commercialization expenses related to product manufacturing, sales, marketing and distribution efforts. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise sufficient capital when needed, we may be forced to delay, reduce or eliminate current or future research programs, product development activities and/or commercialization efforts.

Adequate additional financing may not be available to us on acceptable terms, or at all. If we are unable to obtain sufficient funding on a timely basis or on favorable terms, we may be required to significantly delay, reduce or eliminate one or more of our research or product development programs and/or commercialization efforts. We may also be unable to expand our operations or otherwise capitalize on business opportunities as desired. Any of these events could materially adversely affect our financial condition and business prospects.

We have a limited operating history, which makes it difficult to evaluate our current business and future prospects and may increase the risk of your investment.

We are a genome editing company with a limited operating history. We began principal business operations in 2012 and spent the first three years of our company's history developing and refining our core technology, and only since then have we focused our efforts on advancing the development of product candidates.

Investment in biopharmaceutical product development is a highly speculative endeavor and entails substantial upfront capital expenditures. There is significant risk that any product candidate will fail to demonstrate adequate efficacy or an acceptable safety profile, obtain any required regulatory approvals or become commercially viable. Our platforms and the technologies we are using are new and unproven. We have not yet commenced human clinical trials for any of our product candidates, nor have we demonstrated an ability to initiate or successfully complete any clinical trials, obtain any required marketing approvals, manufacture products, conduct sales, marketing and distribution activities, or arrange for a third party to do any of the foregoing on our behalf.

Consequently, any predictions made about our future success or viability may not be as accurate as they could be if we had a history of successfully developing and commercializing products. Our limited operating history, particularly in light of the rapidly evolving nature of the biopharmaceutical industries and the genome editing field, may make it difficult to evaluate our technology and business prospects or to predict our future performance.

We may expend our limited resources pursuing particular research programs or product candidates that may be less successful or profitable than other programs or product candidates.

Research programs to identify new product candidates and product development platforms require substantial technical, financial, and human resources. We may focus our efforts and resources on potential programs, product candidates or product development platforms that ultimately prove to be unsuccessful. Clinical trials of any of our product candidates is not assured despite the expenditure of significant resources in pursuit of their development, and our spending on current and future research and development programs, product candidates and product development platforms may not yield any commercially viable products.

Additionally, if we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing or other strategic arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate.

Our financial situation creates doubt whether we will continue as a going concern.

The Company has not generated any revenues to date. For the years ended December 31, 2019 and 2018, the Company had a net loss of $3,727,900 and $3,815,700 respectively. For the six months ended June 30, 2020 and 2019, the Company had a net loss of $13,219,600 and $671,300, respectively. There can be no assurances that we will be able to achieve a level of revenues adequate to generate sufficient cash flow from operations or obtain funding from this offering or additional financing through private placements, public offerings and/or bank financing necessary to support our working capital requirements. No assurance can be given that additional financing will be available, or if available, will be on acceptable terms. These conditions raise substantial doubt about our ability to continue as a going concern.

Our business may be adversely affected by the ongoing coronavirus pandemic.

The outbreak of the novel Coronavirus ("COVID-19") has evolved into a global pandemic. COVID-19 has spread to many regions of the world. The extent to which COVID-19 impacts our business and operating results will depend on future developments that are highly uncertain and cannot be accurately predicted, including new information that may emerge concerning COVID-19 and the actions to contain COVID-19 or treat its impact, among others.

Should COVID-19 continue to spread, our business operations could be delayed or interrupted. For instance, our research and development may be affected by the pandemic. Site initiation, participant recruitment and enrollment, participant dosing, distribution of clinical trial materials, study monitoring and data analysis may be paused or delayed due to changes in hospital or university policies, federal, state or local regulations, prioritization of hospital resources toward pandemic efforts, or other reasons related to the pandemic. If COVID-19 continues to spread, some participants and clinical investigators may not be able to comply with clinical trial protocols. For example, quarantines or other travel limitations (whether voluntary or required) may impede participant movement, affect sponsor access to study sites, or interrupt healthcare services, and we may be unable to conduct our research activities, including clinical trials.

Infections and deaths related to the pandemic may disrupt the United States' healthcare and healthcare regulatory systems. Such disruptions could divert healthcare resources away from, or materially delay FDA review and/or approval. It is unknown how long these disruptions could continue, were they to occur. Any elongation or de-prioritization of clinical trials or delay in regulatory review resulting from such disruptions could materially affect the development and study of our product candidates.

In the event of a shelter-in-place order or other mandated local travel restrictions, our employees conducting research and development or manufacturing activities may not be able to access their laboratory or manufacturing space, and our core activities may be significantly limited or curtailed, possibly for an extended period of time.

The spread of COVID-19, which has caused a broad impact globally, including restrictions on travel and quarantine policies put into place by businesses and governments, may have a material economic effect on our business. While the potential economic impact brought by and the duration of the pandemic may be difficult to assess or predict, it has already caused, and is likely to result in further, significant disruption of global financial markets, which may reduce our ability to access capital either at all or on favorable terms. In addition, a recession, depression or other sustained adverse market event resulting from the spread of COVID-19 could materially and adversely affect our business and the value of our common stock.

The ultimate impact of the current pandemic, or any other health epidemic, is highly uncertain and subject to change. We do not yet know the full extent of potential delays or impacts on our business, our clinical trials, our research programs, healthcare systems or the global economy as a whole. However, these effects could have a material impact on our operations, and we will continue to monitor the situation closely.

We will incur increased costs as a result of becoming a public company and in the administration of our organizational structure.

As a public company, we will incur significant legal, accounting, insurance, and other expenses that we have not incurred as a private company, including costs associated with public company reporting requirements. We also have incurred and will incur costs associated with the Sarbanes-Oxley Act and related rules implemented by SEC. Following the consummation of this offering, we will incur ongoing periodic expenses in connection with the administration of our organizational structure. The expenses incurred by public companies generally for reporting and corporate governance purposes have been increasing. We expect these rules and regulations to increase our legal and financial compliance costs and to make some activities more time-consuming and costly, although we are currently unable to estimate these costs with any significant degree of certainty. In estimating these costs however, we took into account expenses related to insurance, legal, accounting, and compliance activities, as well as other expenses not currently incurred. These laws and regulations could also make it more difficult or costly for us to obtain certain types of insurance, including director and officer liability insurance, and we may be forced to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. These laws and regulations could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as our executive officers. Furthermore, if we are unable to satisfy our obligations as a public company, we could be subject to delisting of our common stock, fines, sanctions and other regulatory action and potentially civil litigation.

We identified material weaknesses in our internal control over financial reporting at December 31, 2019, and we may identify additional material weaknesses in the future that may cause us to fail to meet our reporting obligations or result in material misstatements of our financial statements. If we fail to remediate any material weaknesses or if we otherwise fail to establish and maintain effective control over financial reporting, our ability to accurately and timely report our financial results could be adversely affected.

We are not currently required to comply with the rules of the SEC implementing Section 404 of the Sarbanes- Oxley Act and are therefore not required to make a formal assessment of the effectiveness of our internal control over financial reporting for that purpose. Upon becoming a public company, we will be required to comply with the SEC's rules implementing Sections 302 and 404 of the Sarbanes-Oxley Act, which will require management to certify financial and other information in our quarterly and annual reports and provide an annual management report on the effectiveness of controls over financial reporting. Though we will be required to disclose changes made in our internal controls and procedures on a quarterly basis, we will not be required to make our first annual assessment of our internal control over financial reporting pursuant to Section 404 until the year following our first annual report required to be filed with the SEC. However, as an emerging growth company, our independent registered public accounting firm will not be required to formally attest to the effectiveness of our internal control over financial reporting pursuant to Section 404 until the later of the year following our first annual report required to be filed with the SEC or the date we are no longer an emerging growth company. At such time, our independent registered public accounting firm may issue a report that is adverse in the event it is not effective.

Notwithstanding the foregoing, in connection with the audit of our financial statements for the year ended December 31, 2019, we and our auditors identified certain control deficiencies in the design and operation of our internal control over financial reporting that constituted material weaknesses. A

material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our financial statements will not be prevented or detected on a timely basis.

The material weaknesses resulted from (i) our lack of a formalized internal control framework, (ii) our lack of segregation of duties in the financial reporting process, and (iii) our lack of qualified technical accounting personnel. These remain material weakness as of the date of this prospectus. In order to remediate this material weakness, we have hired and plan to continue to hire additional accounting, finance, system engineers, and data analysts. We have implemented, and plan to continue to implement, new controls, new processes and technologies to implement formalized internal controls framework and procedures. We cannot assure you that the measures that we have taken to remediate, and that will be taken to remediate, these material weaknesses will be sufficient to prevent future material weaknesses from occurring. We also cannot assure you that we have identified all of our existing material weaknesses.

In light of the control deficiencies and the resulting material weaknesses that were identified, we believe that it is possible that, had we and our registered public accounting firm performed an assessment or audit, respectively, of our internal control over financial reporting in accordance with the provisions of the Sarbanes-Oxley Act, additional material weaknesses may have been identified.

When evaluating our internal control over financial reporting, we may identify material weaknesses that we may not be able to remediate in time to meet the applicable deadline imposed upon us for compliance with the requirements of Section 404. If we are unable to remediate our existing material weaknesses or identify additional material weaknesses and are unable to comply with the requirements of Section 404 in a timely manner or assert that our internal control over financial reporting is effective, or if our independent registered public accounting firm is unable to express an opinion as to the effectiveness of our internal control over financial reporting once we are no longer an emerging growth company, investors may lose confidence in the accuracy and completeness of our financial reports and the market price of our common stock could be negatively affected, and we could become subject to investigations by the stock exchange on which our securities are listed, the SEC or other regulatory authorities, which could require additional financial and management resources.

Our business is dependent on the successful development, regulatory approval and commercialization of our personalized immunotherapy product candidates, which are in the early stages of development and has not been tested in humans.

We have no products approved for sale. The success of our business, including our ability to finance our company and generate any revenue in the future, will primarily depend on the successful development, regulatory approval and commercialization of ALEXIS Isoform Mesothelin EOC, PD-1, AIDT-1, as well as other product candidates derived from our tumor-specific immunotherapy approach, which may never occur.

In the future, we may also become dependent on other product candidates that we may develop or acquire; however, no product candidates based on our tumor-specific immunotherapy approach have been tested in humans and given our early stage of development, it may be many years, if at all, before we have demonstrated the safety and efficacy of a personalized immunotherapy treatment sufficient to warrant approval for commercialization.

We have not previously submitted a biologics license application, or BLA, to the FDA or similar regulatory approval filings to comparable foreign authorities, for any product candidate, and we cannot be certain that our product candidates will be successful in clinical trials or receive regulatory approval. Further, any future product candidates may not receive regulatory approval even if they are successful in clinical trials. If we do not receive regulatory approvals for our product candidates, we may not be

able to continue our operations. Even if we successfully obtain regulatory approvals to market a product candidate, our revenue will be dependent, in part, upon the size of the markets in the territories for which we gain regulatory approval and have commercial rights. If the markets or patient subsets that we are targeting are not as significant as we estimate, we may not generate significant revenues from sales of such products, if approved.

We plan to seek regulatory approval to commercialize our product candidates both in the United States and in selected foreign countries. While the scope of regulatory approval generally is similar in other countries, in order to obtain separate regulatory approval in other countries we must comply with numerous and varying regulatory requirements of such countries regarding safety and efficacy. Other countries also have their own regulations governing, among other things, clinical trials and commercial sales, as well as pricing and distribution of our product candidates, and we may be required to expend significant resources to obtain regulatory approval and to comply with ongoing regulations in these jurisdictions.

The clinical and commercial success of our current and any future product candidates will depend on a number of factors, including the following:

These factors, many of which are beyond our control, could cause us to experience significant delays or an inability to obtain regulatory approvals or commercialize our current or future product candidates. Even if regulatory approvals are obtained, we may never be able to successfully commercialize any product candidates. Accordingly, we cannot provide assurances that we will be able to generate sufficient revenue through the sale of our product candidate or any future product candidates to continue our business or achieve profitability.

Our tumor-specific cancer immunotherapy approach is based on novel ideas and technologies that are unproven and may not result in marketable products, which exposes us to unforeseen risks and makes it difficult for us to predict the time and cost of product development and potential for regulatory approval.

We are using our proprietary technologies to develop tumor-specific immunotherapy product candidates to treat cancer. Our foundational science and product development approach are based on our ability to predict the presence of a patient's tumor-specific iso-antigens, or TSIAs, and develop a TSIA-directed therapy that will elicit a meaningful specific immune-system cell response (T or NK cells). We believe that this approach may offer an improved therapeutic effect by driving an intense, focused attack selectively upon a patient's tumor. However, this approach to treating cancer is novel and the scientific research that forms the basis of our efforts to predict the presence of TSIA and to develop a CAR that targets TSIA-directed cancer immunotherapy candidates is both preliminary and limited.

Our tumor-specific immunotherapy product candidates have experienced limited testing in humans. We are currently in the process of validating different tumor-specific immunotherapy product candidates. When we validate adequate biomarkers for these product candidates, we will commence preclinical animal studies, and the results of our preclinical animal studies may not translate into humans. For example, our prediction model may fail to accurately predict the presence of TSIAs, resulting in little or no T cell activity, or our therapy may fail to elicit a significant or durable enough T or NK cell response to effectively destroy a tumor.

As such, we cannot assure you that even if we are able to develop cancer immunotherapy candidates capable of recognizing TSIA and eliciting a T cell response, that such therapy would safely and effectively treat cancers. We may spend substantial funds attempting to develop this approach and never succeed in developing a marketable therapeutic.

Furthermore, no regulatory authority has granted approval for a cancer immunotherapy based on a heterologous prime-boost approach. As such, we believe the FDA has limited experience with

evaluating our approach, which may increase the complexity, uncertainty and length of the regulatory approval process for our product candidates. We may never receive approval to market and commercialize any product candidate. Even if we obtain regulatory approval, the approval may be for targets, disease indications, lines of therapy or patient populations that are not as broad as we intended or desired or may require labeling that includes significant use or distribution restrictions or safety warnings.

We may be required to perform additional or unanticipated clinical trials to obtain approval or be subject to post-marketing testing requirements to maintain regulatory approval. If our immunotherapy candidates prove to be ineffective, unsafe or commercially unviable, our entire technology platform and pipeline would have little, if any, value, which would have a material and adverse effect on our business, financial condition, results of operations and prospects.

Diamond, CancerSplice and ABBIE are novel technologies, making it difficult to predict the time, cost and potential success of product candidate development. We have not yet been able to assess the safety and efficacy of any product candidates in humans. Our success depends on our ability to develop and commercialize product candidates using our novel genome editing technology ABBIE. The novel nature of our technology makes it difficult to accurately predict the developmental challenges we may face for product candidates as they proceed through research, preclinical or greenhouse studies and clinical or field trials.

There have been a limited number of clinical trials of products created with genome editing technologies, none of which has utilized our technology, and no therapeutic product candidates created with other genome editing technologies have received marketing approval in the United States or Europe. Because our therapeutic research programs are all in research or preclinical stages, we have not yet been able to assess the safety or efficacy of any product candidates in humans.

Current or future product candidates may not meet safety and efficacy requirements for continued development or ultimate approval in humans and may cause significant adverse events or toxicities. All of our product candidates are designed to act at the level of DNA, and because animal DNA differs from human DNA, it will be difficult for us to test our therapeutic product candidates in animal models for either safety or efficacy, and any testing that we conduct may not translate to their effects in humans. Moreover, animal models may not exist for some of the targets, diseases or indications that we intend to pursue.

Our product candidates may not be able to properly implement desired genetic edits with sufficient accuracy to be viable therapeutic products, and there may be long-term effects associated with them that we cannot predict at this time. Any problems we experience related to the development of our genome editing technology or any of our or our collaborators' research programs or product candidates may cause significant delays or unanticipated costs, and we may not be able to satisfactorily solve such problems. These factors may prevent us or our collaborators from completing our preclinical studies or any clinical trials that we or our collaborators may initiate, or profitably commercializing any product candidates on a timely basis, or at all.

The genome editing field is relatively new and evolving rapidly, and other existing or future technologies may provide significant advantages over our Diamond, CancerSplice and ABBIE technologies, which could materially harm our business.

To date, we have focused our efforts on optimizing our proprietary genome editing technology and exploring its potential applications. Other companies have previously undertaken research and development of genome editing technologies using sequence-specific DNA-cutting enzymes, or nucleases, that are designed to perform modifications in the DNA of living cells and organisms, or using zinc finger nucleases, transcription activator- like effector nucleases, or TALENs, and clustered regularly interspaced short palindromic repeats associated protein-9 nuclease, or CRISPR/Cas9,

although none has obtained marketing approval for a product candidate developed using such technologies. Other genome editing technologies, or other existing or future technologies, may lead to the development of treatments or products that may be considered better suited for use in human therapeutics, which could reduce or eliminate our commercial opportunity.

We are heavily dependent on the successful development and translation of our technologies, and due to the early stages of our product development operations, we cannot give any assurance that any product candidates will be successfully developed and commercialized. To date, we have invested substantially all of our efforts and financial resources to develop our technologies and advance our current product development programs, including conducting preclinical studies and other early research and development activities, and providing general and administrative support for these operations.

Our future success is dependent on our ability to successfully develop and, where applicable, obtain regulatory approval for, including marketing approval for, and then successfully commercialize, product candidates, either alone or with collaborators. We have not yet developed and commercialized any product candidates, and we may not be able to do so, alone or with collaborators. Our research and development programs may not lead to the successful identification, development or commercialization of any products.

The success of our business depends primarily upon our ability to identify, develop and commercialize products using our proprietary technologies.

All of our current product candidates and product development programs are still in the IND validation process. We may be unsuccessful in advancing those product candidates into clinical development or in identifying any developing additional product candidates.

Our ability to identify and develop product candidates is subject to the numerous risks associated with preclinical and early stage biotechnology development activities, including that:

Even if we do commence clinical trials of product candidates and continue to identify new product candidates, such product candidates may never be approved. Failure to successfully identify and develop

new product candidates and obtain regulatory approvals for our products would have a material adverse effect on our business and financial condition and could cause us to cease operations.

If our product candidates do not achieve projected development milestones or commercialization in the announced or expected timeframes, the further development or commercialization of such product candidates may be delayed, and our business will be harmed.

We sometimes estimate, or may in the future estimate, the timing of the accomplishment of various scientific, clinical, manufacturing, regulatory and other product development objectives. These milestones may include our expectations regarding the commencement or completion of scientific studies or clinical or field trials, the submission of regulatory filings, the receipt of marketing approval or the realization of other commercialization objectives.

The achievement of many of these milestones may be outside of our control. All of these milestones are based on a variety of assumptions, including assumptions regarding capital resources, constraints and priorities, progress of and results from development activities and the receipt of key regulatory approvals or actions, any of which may cause the timing of achievement of the milestones to vary considerably from our estimates.

If our collaborators or ourselves fail to achieve announced milestones in the expected timeframes, the commercialization of the product candidates may be delayed, our credibility may be undermined, our business and results of operations may be harmed, and the price of our common stock may decline.

Product liability lawsuits against us could cause us to incur substantial liabilities and could limit commercialization of any products that we develop alone or with collaborators.

We face an inherent risk of product liability and professional indemnity exposure related to the testing in clinical trials of our product candidates. We will face an even greater liability risk if we commercially sell any products that we or our collaborators may develop for human use.

Manufacturing defects, errors in product distribution or storage processes, improper administration or application and known or unknown side effects of product usage may result in liability claims against us or third parties with which we have relationships. These actions could include claims resulting from acts by our collaborators, licensees and subcontractors over which we have little or no control. For example, our liability could be sought by patients participating in clinical trials for potential therapeutic product candidates as a result of unexpected side effects, improper product administration or the deterioration of a patient's condition, patient injury or even death.

Criminal or civil proceedings might be filed against us by patients, regulatory authorities, biopharmaceutical companies and any other third party using or marketing any product candidates or products that we develop alone or with collaborators. On occasion, large judgments have been awarded in class action lawsuits based on products that had unanticipated adverse effects. If we cannot successfully defend ourselves against claims that product candidates or products we develop alone or with collaborators caused harm, we could incur substantial liabilities.

Clinical development does not always fully characterize the safety and efficacy profile of a new medicine, and it is always possible that a drug or biologic, even after regulatory approval, may exhibit unforeseen side effects. If our product candidates were to cause adverse side effects during clinical trials or after approval, we may be exposed to substantial liabilities.

Product liability insurance coverage may not be adequate to cover all liabilities that we may incur. We anticipate that we will need to increase our insurance coverage when we begin clinical trials and if our collaborators or ourselves successfully commercialize any products.

Our future success depends on our ability to retain our Chief Executive Officer, and other key executives and to attract, retain and motivate qualified personnel.

We are highly dependent on the research and development experience, technical skills, leadership and continued service of certain members of our management and scientific teams, including Maurizio Chiriva Internati, our Chief Executive Officer, Scott Dahlbeck, our Chief Medical Officer, Gianluca Rotino, our Chief Strategy and Innovation Officer, and Tony Tontat, our Chief Financial Officer and Chief Operating Officer.

Although we have formal employment agreements with our executive officers, these agreements do not prevent them from terminating their employment with us at any time. We maintain a $10 million "key man" life insurance policy for Dr. Chiriva Internati, our Chief Executive Officer, but not for any of our other team members. The loss of the services of any of these persons could impede the achievement of our research, development and commercialization objectives.

Recruiting and retaining qualified scientific, clinical, manufacturing and, if we retain commercialization responsibility for any product candidate we develop alone or with collaborators, sales and marketing personnel, will also be critical to our success. We may not be able to attract and retain these personnel on acceptable terms or at all given the competition among numerous pharmaceutical and biotechnology companies for similar personnel. We also experience competition for the hiring of scientific and clinical personnel from universities and research institutions. In addition, we rely on consultants and advisors, including scientific and clinical advisors, to assist us in formulating our research and development and commercialization strategies. Our consultants and advisors may be employed by employers other than us and may have commitments under consulting or advisory contracts with other entities that may limit their availability to us.

The inability to recruit, integrate, motivate and retain additional skilled and qualified personnel, or the loss of services of certain executives, key employees, consultants or advisors, may impede the progress of our research, development and commercialization objectives and have a material adverse effect on our business.

We will need to expand our organization, and we may experience difficulties in managing this growth, which could disrupt our operations.

We will need to significantly expand our organization, and our future financial performance, ability to develop and commercialize product candidates alone or with collaborators and ability to compete effectively will depend in part on our ability to effectively manage any future growth. We may have difficulty identifying, hiring and integrating new personnel.

Many of the biotechnology companies that we compete against for qualified personnel and consultants have greater financial and other resources, different risk profiles and a longer history than we do. If we are unable to continue to attract and retain high-quality personnel and consultants, the rate and success at which we can identify and develop product candidates, enter into collaborative arrangements and otherwise operate our business will be limited.

Future growth would impose significant additional responsibilities on our management, including the need to identify, recruit, maintain, motivate and integrate additional employees, consultants and contractors. Management may need to divert a disproportionate amount of its attention away from our day-to-day activities and devote a substantial amount of time to managing these growth activities. Due to our limited financial resources and the limited experience of our management team in managing a company with such anticipated growth, we may not be able to effectively manage the expected expansion of our operations or recruit and train additional qualified personnel.

Moreover, the expected physical expansion of our operations may lead to significant costs and may divert our management and business development resources from other projects, such as the development of product candidates. If we are not able to effectively manage the expansion of our operations, it may result in weaknesses in our infrastructure, increase our expenses more than expected, give rise to operational mistakes, loss of business opportunities, loss of employees and reduced productivity.

Our insurance policies are expensive and protect us only from some business risks, which leaves us exposed to significant uninsured liabilities.

We do not carry insurance for all categories of risk that our business may encounter. If we obtain marketing approval for any product candidates that we or our collaborators may develop, we intend to acquire insurance coverage to include the sale of commercial products, but we may be unable to obtain such insurance on commercially reasonable terms or in adequate amounts. We do not carry specific biological or hazardous waste insurance coverage, and our property, casualty and general liability insurance policies specifically exclude coverage for damages and fines arising from biological or hazardous waste exposure or contamination.

Accordingly, in the event of contamination or injury, we could be held liable for damages or be penalized with fines in an amount exceeding our resources, and clinical trials or regulatory approvals for any of our product candidates could be suspended. We also expect that operating as a public company will make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. As a result, it may be more difficult for us to attract and retain qualified individuals to serve on our board of directors, our board committees or as our executive officers.

Insurance coverage is becoming increasingly expensive, and in the future, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses. We do not know if we will be able to maintain existing insurance with adequate levels of coverage, and any liability insurance coverage we acquire in the future may not be sufficient to reimburse us for any expenses or losses we may suffer. A successful liability claim or series of claims brought against us could require us to pay substantial amounts and cause our share price to decline and, if judgments exceed our insurance coverage, could adversely affect our results of operations and business, including preventing or limiting the development and commercialization of any product candidates that we or our collaborators may develop.

We are subject to complex tax rules relating to our business, and any audits, investigations or tax proceedings could have a material adverse effect on our business, results of operations and financial condition.

We are subject to income and non-income taxes in the United States. Income tax accounting often involves complex issues, and judgment is required in determining our provision for income taxes and other tax liabilities. We could become subject to income and non-income taxes in non-US jurisdictions as well. In addition, many operating foreign jurisdictions have detailed transfer pricing rules, which require that all transactions with non-resident related parties be priced using arm's length pricing principles within the meaning of such rules. The application of withholding tax, goods and services tax, sales taxes and other non-income taxes is not always clear and we may be subject to tax audits relating to such withholding or non-income taxes. We believe that our tax positions are reasonable, and our tax reserves are adequate to cover any potential liability. We are currently not subject to any tax audits.

However, the Internal Revenue Service or other taxing authorities may disagree with our positions. If the Internal Revenue Service or any other tax authorities were successful in challenging our positions, we may be liable for additional tax and penalties and interest related thereto or other taxes, as

applicable, in excess of any reserves established therefor, which may have a significant impact on our results and operations and future cash flow.

Our business and operations would suffer in the event of system failures or security breaches.

Despite the implementation of security measures, our computer systems, as well as those of third parties with which we have relationships, are vulnerable to damage from computer viruses, unauthorized access, natural and manmade disasters, terrorism, war and telecommunication and electrical failures. If we were to experience a system failure, accident or security breach such an event caused interruptions in our or their operations, it could result in delays and/or material disruptions of our research and development programs.

For example, the loss of trial data from completed, ongoing or planned trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of or damage to data or applications, or inappropriate disclosure of personal, confidential or proprietary information, we could incur liability and the development of our product candidates could be delayed.

The U.S. federal and various state and foreign governments have enacted or proposed requirements regarding the collection, distribution, use, security and storage of personally identifiable information and other data relating to individuals, and U.S. federal and state consumer protection laws are being applied to enforce regulations related to the online collection, use and dissemination of data. In the ordinary course of our business, we and third parties with which we have relationships collect and store sensitive data, including intellectual property, clinical trial data, proprietary business information, personal data and personally identifiable information of our clinical trial subjects and employees, in data centers and on networks. The secure processing, maintenance and transmission of this information is critical to our operations. Despite our and our collaborators' security measures, our information technology and infrastructure may be vulnerable to attacks by hackers or internal bad actors, breaches due to employee error, technical vulnerabilities, malfeasance or other disruptions, and any such breach could compromise our or their networks and the information stored there could be accessed, publicly disclosed, lost or stolen.

Any such access, disclosure, notifications, follow-up actions related to such a security breach or other loss of information could result in legal claims or proceedings, liability under laws that protect the privacy of personal information and significant costs, including regulatory penalties, fines and legal expenses, and such an event could disrupt our operations, cause us to incur remediation costs, damage our reputation and cause a loss of confidence in us and our or such third parties' ability to conduct clinical trials, which could adversely affect our reputation and delay our research and development programs.

We or third parties with whom we have relationships may be adversely affected by natural or manmade disasters, and our business continuity and disaster recovery plans may not adequately protect us from a serious disaster.

Natural or manmade disasters could severely disrupt our operations and have a material adverse effect on our business, results of operations, financial condition and prospects. If a natural disaster, power outage or other event occurred that prevented us from using all or a significant portion of our facilities, that damaged our infrastructure or that otherwise disrupted operations, it may be difficult or, in certain cases, impossible for us to continue our business for a substantial period of time, and our research and development activities could be setback or delayed.

The disaster recovery and business continuity plan(s) we have in place may prove inadequate in the event of a serious disaster or similar event. We may incur substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which could have a material adverse

effect on our business, and such an event could disrupt our operations, cause us to incur remediation costs, damage our reputation and cause a loss of confidence in us and our or third parties' ability to conduct clinical trials, which could adversely affect our reputation and delay our research and development programs.

Our relationships with healthcare professionals, clinical investigators, CROs and third party payors in connection with our current and future business activities may be subject to federal and state healthcare fraud and abuse laws, false claims laws, transparency laws, government price reporting, and health information privacy and security laws, which could expose us to, among other things, criminal sanctions, civil penalties, contractual damages, exclusion from governmental healthcare programs, reputational harm, administrative burdens and diminished profits and future earnings.

Healthcare providers and third-party payors play a primary role in the recommendation and prescription of any product candidates for which we obtain marketing approval. Our current and future arrangements with healthcare professionals, clinical investigators, CROs, third-party payors and customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market, sell and distribute our products for which we obtain marketing approval. Restrictions under applicable federal and state healthcare laws and regulations include the following:

Some state laws require biotechnology companies to comply with the biotechnology industry's voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures. Some state laws require biotechnology companies to report information on the pricing of certain drug products.

State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts. For instance, the collection and use of health data in the European Union is governed by the General Data Protection Regulation, or the GDPR, which extends the geographical scope of European Union data protection law to non-European Union entities under certain conditions, tightens existing European Union data protection principles, creates new obligations for companies and new rights for individuals. Failure to comply with the GDPR may result in substantial fines and other administrative penalties. The GDPR may increase our responsibility and liability in relation to personal data that we process and we may be required to put in place additional mechanisms ensuring compliance with the GDPR. This may be onerous and if our efforts to comply with GDPR or other applicable European Union laws and regulations are not successful, it could adversely affect our business in the European Union. Moreover, the United Kingdom leaving the EU could also lead to further legislative and regulatory changes. It remains unclear how the United Kingdom data protection laws or regulations will develop in the medium to longer term and how data transfer to the United Kingdom from the EU will be regulated, especially following the United Kingdom's departure from the EU on January 31, 2020 without a deal. However, the United Kingdom has transposed the GDPR into domestic law with the Data Protection Act 2018, which remains in force following the United Kingdom's departure from the EU. In addition, on June 28, 2018, the State of California enacted the California Consumer Privacy Act, or CCPA, which went into effect on January 1, 2020. The CCPA creates individual privacy rights for California consumers and increases the privacy and security obligations of entities handling certain personal information. The CCPA provides for civil penalties for violations, as well as a private right of action for data breaches that is expected to increase data breach litigation. The CCPA may increase our compliance costs and potential liability, and similar laws have been proposed at the federal level and in other states.

Efforts to ensure that our current and future business arrangements with third parties will comply with applicable healthcare laws and regulations will involve on-going substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant penalties, including civil, criminal and administrative penalties, damages, fines, disgorgement, individual imprisonment, exclusion from participation in government funded healthcare programs, such as Medicare and Medicaid, integrity oversight and reporting obligations, contractual damages, reputational harm, diminished profits and future earnings and the curtailment or restructuring of our operations. Defending against any such actions can be costly, time-consuming and may require significant financial and personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our business may be impaired. Further, if any of the physicians or other healthcare providers or entities with whom we expect to do business is found to be not in compliance

with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.

We expect to depend on collaborations with third parties for certain research, development and commercialization activities, and if any such collaborations are not successful, it may harm our business and prospects.

Working with collaborators poses several significant risks, including the following:

Our ability to generate revenues from these arrangements will depend on our collaborators' abilities to successfully perform the functions assigned to them in these arrangements. If our collaborations do not result in the successful development and commercialization of product candidates or technologies, or if one of our collaborators terminates its agreement with us, we may not receive any future funding or milestone or royalty payments under the collaboration.

If we do not receive the funding we expect under these agreements, our development of product candidates or technologies could be delayed, and we may need additional resources to develop such product candidates or technologies. In addition, if one of our collaborators terminates its agreement with us, we may find it more difficult to find a suitable replacement collaborator or attract new collaborators and may need to raise additional capital to pursue further development or commercialization of the applicable product candidates or technologies.

These events could delay development programs and negatively impact the perception of our company in business and financial communities. Failure to develop or maintain relationships with any current collaborators could result in the loss of opportunity to work with that collaborator or reputational damage that could impact our relationships with other collaborators in the relatively small industry communities in which we operate.

Moreover, all of the risks relating to product development, regulatory approval and commercialization described in this prospectus apply to the activities of our collaborators. If our existing collaboration agreements or any collaborative or strategic relationships we may establish in the future are not effective and successful, it may damage our reputation and business prospects, delay or prevent the

development and commercialization of product candidates and inhibit or preclude our ability to realize any revenues.

We expect to rely on third parties to conduct, supervise and monitor our clinical trials and some aspects of our research and preclinical testing, and if those third parties do not successfully carry out their contractual duties, comply with regulatory requirements, or otherwise perform in a satisfactory manner, we may not be able to obtain regulatory approval or commercialize product candidates, or such approval or commercialization may be delayed, and our business may be substantially harmed.

We expect to rely on medical institutions, clinical investigators, contract laboratories and other third parties, such as contract research organizations, or CROs, to conduct preclinical studies and future clinical trials for our product candidates. Nevertheless, we will be responsible for ensuring that each of our studies and trials is conducted in accordance with the applicable protocol, legal and regulatory requirements and scientific standards, and our reliance on such third parties will not relieve us of our regulatory responsibilities. For example, we will remain responsible for ensuring that each of our clinical trials is conducted in accordance with the general investigational plan and protocols for the trial. Moreover, the FDA requires us to comply with regulations, commonly referred to as good clinical practices, or GCPs, for conducting, monitoring, recording and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the rights, integrity and confidentiality of trial participants are protected.

Although we intend to design the trials for our product candidates either alone or with collaborators, third parties may conduct all of the trials. As a result, many important aspects of our research and development programs, including their conduct and timing, will be outside of our direct control. Our reliance on third parties to conduct future studies and trials will also result in less direct control over the management of data developed through studies and trials than would be the case if we were relying entirely upon our own staff. Communicating with outside parties can also be challenging, potentially leading to mistakes and difficulties in coordinating activities. Such third parties may have staffing difficulties, fail to comply with contractual obligations, experience regulatory compliance issues, undergo changes in priorities, become financially distressed or form relationships with other entities, some of which may be our competitors.

We also face the risk of potential unauthorized disclosure or misappropriation of our intellectual property by CROs or other third parties, which may reduce our trade secret protection and allow our potential competitors to access and exploit our proprietary technology. For any violations of laws and regulations during the conduct of our preclinical studies and future clinical trials, we could be subject to warning letters or enforcement action that may include civil penalties up to and including criminal prosecution.

If we, our collaborators, our CROs or other third parties fail to comply with applicable GCPs, the clinical data generated in our clinical trials may be deemed unreliable and FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We also are required to register certain ongoing clinical trials and post the results of such completed clinical trials on a government-sponsored database, ClinicalTrials.gov, within certain timeframes. Failure to do so can result in fines, adverse publicity and civil and criminal sanctions.

If our CROs or other third parties do not successfully carry out their contractual duties or obligations, fail to meet expected deadlines, or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols or regulatory requirements or for any other reasons, trials for product candidates may be extended, delayed or terminated, and we or our collaborators may not be able to obtain regulatory approval for, or successfully commercialize, any product candidate that we develop. If we are required to repeat, extend the duration of or increase the

size of any trials we conduct, it could significantly delay commercialization and require significantly greater expenditures.

As a result of any of these factors, our financial results and the commercial prospects for any product candidate that we or our collaborators may develop would be harmed, our costs could increase and our ability to generate revenues could be delayed.

If we are unable to obtain sufficient quantities of raw materials and supplies, at acceptable prices and on a timely basis, it could harm our business.

We are dependent on third parties for the supply of various biological materials, such as cells, cytokines and antibodies, and the manufacture of product supplies, such as media, plasmids, mRNA and viral vectors, that are necessary to produce our product candidates. The supply of these materials could be reduced or interrupted at any time. In such case, identifying and engaging an alternative supplier or manufacturer could result in delay, and we may not be able to find other acceptable suppliers or manufacturers on acceptable terms, or at all.

Changing suppliers or manufacturers may involve substantial costs and is likely to result in a delay in our desired clinical and commercial timelines. If we change suppliers or manufacturers for commercial production, applicable regulatory agencies may require us to conduct additional studies or trials. If key suppliers or manufacturers are lost, or if the supply of the materials is diminished or discontinued, we or our collaborators may not be able to develop, manufacture and market product candidates in a timely and competitive manner, or at all. If any of our product candidates receives approval, we will likely need to seek alternative sources of supply of raw materials or manufactured product supplies and there can be no assurance that we will be able to establish such relationships to provide such supplies on commercially reasonable terms or at acceptable quality levels, if at all.

If we are unable to identify and procure additional sources of supply that fit our required needs, we could face substantial delays or incur additional costs in procuring such materials.

We may rely on third parties for the manufacturing process of product candidates, and failure by those parties to adequately perform their obligations could harm our business.

We do not currently own any facility that may be used as our clinical-scale manufacturing and processing facility and expect that we will rely on outside vendors for at least a portion of the manufacturing process of product candidates that we or our collaborators may develop. The facilities used by our contract manufacturers to manufacture product candidates must be approved by the FDA or other foreign regulatory agencies pursuant to inspections that will be conducted after we submit an application to the FDA or other foreign regulatory agencies. To the extent that we or our collaborators engage third parties for manufacturing services, we will not control the manufacturing process of, and will be completely dependent on, our contract manufacturing providers for compliance with cGMP requirements for manufacture of the product candidates.

We have not yet caused any product candidates to be manufactured or processed on a commercial scale and may not be able to do so. We will make changes as we work to optimize the manufacturing process, and we cannot be sure that even minor changes in the process will result in products that are safe and effective. If our contract manufacturers cannot successfully manufacture material that conforms to our specifications and the strict regulatory requirements of the FDA or other regulatory authorities, they will not be able to secure and/or maintain regulatory approval for their manufacturing facilities. In addition, we have no control over the ability of our contract manufacturers to maintain adequate quality control, quality assurance and qualified personnel.

If the FDA or a comparable foreign regulatory authority does not approve these facilities for the manufacture of product candidates or if it withdraws any such approval in the future, we may need to

find alternative manufacturing facilities, which would significantly impact our ability to develop, obtain regulatory approval for or market any of our or our collaborators' potential products.

If we are not able to establish collaborations on commercially reasonable terms, we may have to alter our research, development and commercialization plans.

Our research and product development programs and the potential commercialization of our product candidates will require substantial additional cash to fund expenses, and we expect that we will continue to seek collaborative arrangements for the development and potential commercialization of current and future product candidates or the development of ancillary technologies.

We face significant competition in establishing relationships with appropriate collaborators. In addition, there have been a significant number of recent business combinations among large pharmaceutical companies that have resulted in a reduced number of potential future collaborators. Whether we reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator's resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator's evaluation of a number of factors. Those factors may include, among other things and as applicable for the type of potential product or technology, an assessment of the opportunities and risks of our technology, the design or results of studies or trials, the likelihood of approval, if necessary, by the USDA, the FDA or similar regulatory authorities outside the United States, the potential market for the subject product candidate, the costs and complexities of manufacturing and delivering such product candidate to patients, the potential of competing products and technologies and industry and market conditions generally.

Collaborations are complex and time-consuming to negotiate and document. We may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we do enter into additional collaboration agreements, the negotiated terms may force us to relinquish rights that diminish our potential profitability from development and commercialization of the subject product candidates or others. If we are unable to enter into additional collaboration agreements, we may have to curtail the research and development of the product candidate or technology for which we are seeking to collaborate, reduce or delay research and development programs, delay potential commercialization timelines, reduce the scope of any sales or marketing activities or undertake research, development or commercialization activities at our own expense.

The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of our product candidates.

The research, testing, manufacturing, labeling, approval, selling, import, export, marketing, and distribution of drug products, including biologics, are subject to extensive regulation by the FDA and other regulatory authorities in the United States. We are not permitted to market any biological drug product in the United States until we receive approval of a BLA from the FDA. We have not previously submitted a BLA to the FDA, or similar approval filings to comparable foreign authorities. A BLA must include extensive preclinical and clinical data and supporting information to establish the product candidate's safety and effectiveness for each desired indication. The BLA must also include significant information regarding the chemistry, manufacturing and controls for the product.

We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. For example, the FDA has limited experience with commercial development of allogenic T cell therapies for cancer. We may also request regulatory approval of future CAR-based product candidates by target, regardless of cancer type or origin, which the FDA may have difficulty accepting if our clinical trials only involved cancers of certain origins. The FDA may also require a panel of experts, referred to as an Advisory Committee, to deliberate on the adequacy of the safety and

efficacy data to support licensure. The opinion of the Advisory Committee, although not binding, may have a significant impact on our ability to obtain licensure of the product candidates based on the completed clinical trials, as the FDA often adheres to the Advisory Committee's recommendations. Accordingly, the regulatory approval pathway for our product candidates may be uncertain, complex, expensive and lengthy, and approval may not be obtained.

We may also experience delays in completing planned clinical trials for a variety of reasons, including delays related to:

We could also encounter delays if physicians encounter unresolved ethical issues associated with enrolling patients in clinical trials of our product candidates in lieu of prescribing existing treatments that have established safety and efficacy profiles. Further, a clinical trial may be suspended or terminated by us, the IRBs for the institutions in which such trials are being conducted or by the FDA or other regulatory authorities due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions, lack of adequate funding to continue the clinical trial, or based on a recommendation by the Data Safety Monitoring Committee. The FDA's review of our data of our ongoing clinical trials may, depending on the data, also result in the delay, suspension or termination of one or more clinical trials, which would also delay or prevent the initiation of our other planned clinical trials. If we experience termination of, or delays in the completion of, any clinical trial of our product candidates, the commercial prospects for our product candidates will be harmed, and our ability to generate product revenue will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product development and approval process and jeopardize our ability to commence product sales and generate revenue.

Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may ultimately lead to the denial of regulatory approval of our product candidates.

We expect the product candidates we develop will be regulated as biological products, or biologics, and therefore they may be subject to competition sooner than anticipated.

The Biologics Price Competition and Innovation Act was enacted as part of the Affordable Care Act to establish an abbreviated pathway for the approval of biosimilar and interchangeable biological products. The regulatory pathway establishes legal authority for the FDA to review and approve biosimilar biologics, including the possible designation of a biosimilar as "interchangeable" based on its similarity to an approved biologic. Under the Biologics Price Competition and Innovation Act, an application for a biosimilar product cannot be approved by the FDA until 12 years after the reference product was approved under a BLA. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact, implementation, and meaning are subject to uncertainty. While it is uncertain when such processes intended to implement the Biologics Price Competition and Innovation Act may be fully adopted by the FDA, any such processes could have a material adverse effect on the future commercial prospects for our biological products.

We believe that any of the product candidates we develop that is approved in the United States as a biological product under a BLA should qualify for the 12-year period of exclusivity. However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, or that the FDA will not consider the subject product candidates to be reference products for competing products, potentially creating the opportunity for generic competition sooner than anticipated. Moreover, the extent to which a biosimilar, once approved, will be substituted for any one of the reference products in a way that is similar to traditional generic substitution for non-biological products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing.

The regulatory landscape that will govern our product candidates is uncertain; regulations relating to more established gene therapy and cell therapy products are still developing, and changes in regulatory requirements could result in delays or discontinuation of development of our product candidates or unexpected costs in obtaining regulatory approval.

Because we are developing novel CAR T cell immunotherapy product candidates that are unique biological entities, the regulatory requirements that we will be subject to are not entirely clear. Even with respect to more established products that fit into the categories of gene therapies or cell therapies, the regulatory landscape is still developing. For example, regulatory requirements governing gene therapy products and cell therapy products have changed frequently and may continue to change in the future. Moreover, there is substantial, and sometimes uncoordinated, overlap in those responsible for regulation of existing gene therapy products and cell therapy products. For example, in the United States, the FDA has established the Office of Tissues and Advanced Therapies, formerly known as the Office of Cellular, Tissue and Gene Therapies, within its Center for Biologics Evaluation and Research to consolidate the review of gene therapy and related products, and the Cellular, Tissue and Gene Therapies Advisory Committee to advise the Center for Biologics Evaluation and Research on its review. Gene therapy clinical trials are also subject to review and oversight by an institutional biosafety committee, or IBC, a local institutional committee that reviews and oversees basic and clinical research conducted at the institution participating in the clinical trial. Although the FDA decides whether individual gene therapy protocols may proceed, review process and determinations of other reviewing bodies can impede or delay the initiation of a clinical study, even if the FDA has reviewed the study and approved its initiation. Conversely, the FDA can place an IND application on clinical hold even if such other entities have provided a favorable review. Furthermore, each clinical trial must be reviewed and approved by an independent IRB at or servicing each institution at which a clinical trial will be conducted. In addition, adverse developments in clinical trials of gene therapy products conducted by others may cause the FDA or other regulatory bodies to change the requirements for approval of any of our product candidates.

Complex regulatory environments exist in other jurisdictions in which we might consider seeking regulatory approvals for our product candidates, further complicating the regulatory landscape. For example, in the EU a special committee called the Committee for Advanced Therapies was established within the European Medicines Agency in accordance with Regulation (EC) No 1394/2007 on advanced-therapy medicinal products to assess the quality, safety and efficacy of advanced-therapy medicinal products, and to follow scientific developments in the field. Advanced-therapy medicinal products include gene therapy products as well as somatic cell therapy products and tissue engineered products.

These various regulatory review committees and advisory groups and new or revised guidelines that they promulgate from time to time may lengthen the regulatory review process, require us to perform additional studies, increase our development costs, lead to changes in regulatory positions and interpretations, delay or prevent approval and commercialization of our product candidates or lead to significant post-approval limitations or restrictions. Because the regulatory landscape for our CAR T cell immunotherapy product candidates is new, we may face even more cumbersome and complex regulations than those emerging for gene therapy products and cell therapy products. Furthermore, even if our product candidates obtain required regulatory approvals, such approvals may later be withdrawn as a result of changes in regulations or the interpretation of regulations by applicable regulatory agencies.

Delay or failure to obtain, or unexpected costs in obtaining, the regulatory approval necessary to bring a potential product to market could decrease our ability to generate sufficient product revenue to maintain our business.

The FDA may disagree with our regulatory plan and we may fail to obtain regulatory approval of our product candidates.

If and when our planned Phase 1 clinical trials for ALEXIS ISOFORM and our other initial product candidates are completed and, assuming positive data, we expect to advance to potential registrational trials. The general approach for FDA approval of a new biologic or drug is for the sponsor to provide dispositive data from two well-controlled, Phase 3 clinical studies of the relevant biologic or drug in the relevant patient population. Phase 3 clinical studies typically involve hundreds of patients, have significant costs and take years to complete. If the results from our clinical trials are sufficiently compelling, we intend to discuss with the FDA submission of a BLA for the relevant product candidate. However, we do not have any agreement or guidance from the FDA that our regulatory development plans will be sufficient for submission of a BLA. For example, the FDA may require that we conduct a comparative trial against an approved therapy including potentially an approved autologous T cell therapy, which would significantly delay our development timelines and require substantially more resources. In addition, the FDA may only allow us to evaluate patients that have failed or who are ineligible for autologous therapy, which are extremely difficult patients to treat and patients with advanced and aggressive cancer, and our product candidates may fail to improve outcomes for such patients.

The FDA may grant accelerated approval for our product candidates and, as a condition for accelerated approval, the FDA may require a sponsor of a drug or biologic receiving accelerated approval to perform post-marketing studies to verify and describe the predicted effect on irreversible morbidity or mortality or other clinical endpoint, and the drug or biologic may be subject to withdrawal procedures by the FDA that are more accelerated than those available for regular approvals. We believe an accelerated approval strategy is warranted given the limited alternatives for patients that our initial product candidates target, but the FDA may ultimately require a Phase 3 clinical trial prior to approval, particularly since our product candidates represent a novel treatment. In addition, the standard of care may change with the approval of new products in the same indications that we are

studying. This may result in the FDA or other regulatory agencies requesting additional studies to show that our product candidate is superior to the new products.

Our clinical trial results may also not support approval. In addition, our product candidates could fail to receive regulatory approval for many reasons, including the following:

We may seek orphan drug designation for some or all of our product candidates across various indications, but we may be unable to obtain such designations or to maintain the benefits associated with orphan drug designation, including market exclusivity, which may cause our revenue, if any, to be reduced.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a disease or condition with a patient population of fewer than 200,000 in the United States, or a patient population greater than 200,000 in the United States when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the United States will be recovered from sales in the United States for that drug or biologic. In order to obtain orphan drug designation, the request must be made before submitting a BLA. In the United States, orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages, and user-fee waivers. After the FDA grants orphan drug designation, the generic identity of the drug and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

If a product that has orphan drug designation subsequently receives the first FDA approval of that particular product for the disease for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications, including a BLA, to market the same biologic (meaning, a product with the same principal molecular structural features) for the same indication for seven years, except in limited circumstances such as a showing of

clinical superiority to the product with orphan drug exclusivity or if FDA finds that the holder of the orphan drug exclusivity has not shown that it can assure the availability of sufficient quantities of the orphan drug to meet the needs of patients with the disease or condition for which the drug was designated. As a result, even if one of our product candidates receives orphan exclusivity, the FDA can still approve other biologics that do not have the same principal molecular structural features for use in treating the same indication or disease or the same biologic for a different indication or disease during the exclusivity period. Furthermore, the FDA can waive orphan exclusivity if we are unable to manufacture sufficient supply of our product or if a subsequent applicant demonstrates clinical superiority over our product.

We may seek orphan drug designation for at least one of our product candidates in specific orphan indications in which there is a medically plausible basis for the use of these products. Even if we obtain orphan drug designation, exclusive marketing rights in the United States may be limited if we seek approval for an indication broader than the orphan designated indication and may be lost if the FDA later determines that the request for designation was materially defective or if we are unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition, or if a subsequent applicant demonstrates clinical superiority over our products, if approved. In addition, although we may seek orphan drug designation for other product candidates, we may never receive such designations.

Regenerative Medicine Advanced Therapy designation, even if granted for any of our product candidates, may not lead to a faster development or regulatory review or approval process and it does not increase the likelihood that our product candidates will receive marketing approval.

We may seek Regenerative Medicine Advanced Therapy, or RMAT, designation for one or more of our product candidates. In 2017, the FDA established the RMAT designation to expedite review of a cell therapy, therapeutic tissue engineering product, human cell and tissue product, or any combination product using such therapies or products, with limited exceptions intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition and for which preliminary clinical evidence indicates that the potential to address unmet medical needs for such a disease or condition. RMAT designation provides potential benefits that include more frequent meetings with FDA to discuss the development plan for the product candidate, and eligibility for rolling review and priority review. Products granted RMAT designation may also be eligible for accelerated approval on the basis of a surrogate or intermediate endpoint reasonably likely to predict long-term clinical benefit, or reliance upon data obtained from a meaningful number of sites, including through expansion to additional sites. There is no assurance that we will be able to obtain RMAT designation for any of our product candidates. RMAT designation does not change the FDA's standards for product approval, and there is no assurance that such designation will result in expedited review or approval or that the approved indication will not be narrower than the indication covered by the designation. Additionally, RMAT designation can be revoked if the criteria for eligibility cease to be met as clinical data emerges.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not mean that we will be successful in obtaining regulatory approval of our product candidates in other jurisdictions.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not guarantee that we will be able to obtain or maintain regulatory approval in any other jurisdiction, while a failure or delay in obtaining regulatory approval in one jurisdiction may have a negative effect on the regulatory approval process in others. For example, even if the FDA grants marketing approval of a product candidate, comparable regulatory authorities in foreign jurisdictions must also approve the manufacturing, marketing and promotion of the product candidate in those countries. Approval procedures vary among jurisdictions and can involve requirements and administrative review periods different from, and greater than, those in the United States, including additional preclinical studies or

clinical trials as clinical studies conducted in one jurisdiction may not be accepted by regulatory authorities in other jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in that jurisdiction. In some cases, the price that we intend to charge for our products is also subject to approval.

We may also submit marketing applications in other countries. Regulatory authorities in jurisdictions outside of the United States have requirements for approval of product candidates with which we must comply prior to marketing in those jurisdictions. Obtaining foreign regulatory approvals and compliance with foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction of our products in certain countries. If we fail to comply with the regulatory requirements in international markets and/or receive applicable marketing approvals, our target market will be reduced and our ability to realize the full market potential of our product candidates will be harmed.

We will be subject to ongoing regulatory obligations and continued regulatory review, which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements or experience unanticipated problems with our product candidates.

Any regulatory approvals that we receive for our product candidates will require surveillance to monitor the safety and efficacy of the product candidate. The FDA may also require a risk evaluation and mitigation strategy in order to approve our product candidates, which could entail requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or a comparable foreign regulatory authority approves our product candidates, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for our product candidates will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of safety and other post-marketing information and reports, registration, as well as continued compliance with cGMPs and GCPs for any clinical trials that we conduct post-approval. As such, we and our contract manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any BLA, other marketing application and previous responses to inspectional observations. Accordingly, we and others with whom we work must continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production and quality control. In addition, the FDA could require us to conduct another study to obtain additional safety or biomarker information. Further, we will be required to comply with FDA promotion and advertising rules, which include, among others, standards for direct-to-consumer advertising, restrictions on promoting products for uses or in patient populations that are not described in the product's approved uses (known as "off-label use"), limitations on industry-sponsored scientific and educational activities and requirements for promotional activities involving the internet and social media.

Later discovery of previously unknown problems with our product candidates, including adverse events of unanticipated severity or frequency, or with our third-party suppliers or manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical studies to assess new safety risks; or imposition of distribution restrictions or other restrictions under a risk evaluation and mitigation strategy program. Other potential consequences include, among other things:

The FDA's and other regulatory authorities' policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative or executive action, either in the United States or abroad. For example, certain policies of the current U.S. President's administration may impact our business and industry. Namely, the current U.S. President's administration has taken several executive actions, including the issuance of a number of Executive Orders, that could impose significant burdens on, or otherwise materially delay, FDA's ability to engage in routine oversight activities such as implementing statutes through rulemaking, issuance of guidance, and review and approval of marketing applications. It is difficult to predict how these orders will be implemented, and the extent to which they will impact the FDA's ability to exercise its regulatory authority. If these executive actions impose restrictions on FDA's ability to engage in oversight and implementation activities in the normal course, our business may be negatively impacted. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability.

Negative public opinion and increased regulatory scrutiny of genetic research and therapies involving gene editing may damage public perception of our product candidates or adversely affect our ability to conduct our business or obtain regulatory approvals for our product candidates.

The gene editing technologies that we use are novel. Public perception may be influenced by claims that gene editing is unsafe, and products incorporating gene editing may not gain the acceptance of the public or the medical community. In particular, our success will depend upon physicians specializing in our targeted diseases prescribing our product candidates as treatments in lieu of, or in addition to, existing, more familiar, treatments for which greater clinical data may be available. Any increase in negative perceptions of gene editing may result in fewer physicians prescribing our treatments or may reduce the willingness of patients to utilize our treatments or participate in clinical trials for our product candidates. Increased negative public opinion or more restrictive government regulations in response thereto, would have a negative effect on our business or financial condition and may delay or impair the development and commercialization of our product candidates or demand for such product candidates.

Even if we obtain regulatory approval of our product candidates, the products may not gain market acceptance among physicians, patients, hospitals, cancer treatment centers and others in the medical community.

The use of engineered T cells as a potential cancer treatment is a recent development and may not become broadly accepted by physicians, patients, hospitals, cancer treatment centers and others in the medical community. We expect physicians in the large bone marrow transplant centers to be particularly influential and we may not be able to convince them to use our product candidates for many reasons. For example, certain of the product candidates that we will be developing target a cell surface marker that may be present on cancer cells as well as non-cancerous cells. It is possible that our product candidates may kill these non-cancerous cells, which may result in unacceptable side effects, including death. Additional factors will influence whether our product candidates are accepted in the market, including:

If our product candidates are approved but fail to achieve market acceptance among physicians, patients, hospitals, cancer treatment centers or others in the medical community, we will not be able to generate significant revenue. Even if our products achieve market acceptance, we may not be able to maintain that market acceptance over time if new products or technologies are introduced that are more favorably received than our products, are more cost effective or render our products obsolete

Coverage and reimbursement may be limited or unavailable in certain market segments for our product candidates, which could make it difficult for us to sell our product candidates, if approved, profitably.

Successful sales of our product candidates, if approved, depend on the availability of coverage and adequate reimbursement from third-party payors including governmental healthcare programs, such as Medicare and Medicaid, managed care organizations and commercial payors, among others. Significant uncertainty exists as to the coverage and reimbursement status of any product candidates for which we obtain regulatory approval. In addition, because our product candidates represent new approaches to the treatment of cancer, we cannot accurately estimate the potential revenue from our product candidates.

Patients who are provided medical treatment for their conditions generally rely on third-party payors to reimburse all or part of the costs associated with their treatment. Obtaining coverage and adequate reimbursement from third-party payors is critical to new product acceptance.

Third-party payors decide which drugs and treatments they will cover and the amount of reimbursement. Reimbursement by a third-party payor may depend upon a number of factors, including, but not limited to, the third-party payor's determination that use of a product is:

Obtaining coverage and reimbursement of a product from a government or other third-party payor is a time- consuming and costly process that could require us to provide to the payor supporting scientific, clinical and cost-effectiveness data for the use of our products. Even if we obtain coverage for a given product, if the resulting reimbursement rates are insufficient, hospitals may not approve our product for use in their facility or third-party payors may require co-payments that patients find unacceptably high. Patients are unlikely to use our product candidates unless coverage is provided and reimbursement is adequate to cover a significant portion of the cost of our product candidates. Separate reimbursement for the product itself may or may not be available. Instead, the hospital or administering physician may be reimbursed only for providing the treatment or procedure in which our product is used. Further, from time to time, the Centers for Medicare & Medicaid Services, or the CMS, revises the reimbursement systems used to reimburse health care providers, including the Medicare Physician Fee Schedule and Outpatient Prospective Payment System, which may result in reduced Medicare payments. In some cases, private third-party payers rely on all or portions of Medicare payment systems to determine payment rates. Changes to government healthcare programs that reduce payments under these programs may negatively impact payments from private third-party payers, and reduce the willingness of physicians to use our product candidates.

In the United States, no uniform policy of coverage and reimbursement for products exists among third-party payors. Therefore, coverage and reimbursement for products can differ significantly from payor to payor. Further, one payor's determination to provide coverage for a product does not assure that other payors will also provide coverage for the product. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development.

We intend to seek approval to market our product candidates in both the United States and in selected foreign jurisdictions. If we obtain approval in one or more foreign jurisdictions for our product candidates, we will be subject to rules and regulations in those jurisdictions. In some foreign countries, particularly those in Europe, the pricing of biologics is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after obtaining marketing approval of a product candidate. Some of these countries may require the completion of clinical trials that compare the cost-effectiveness of a particular product candidate to currently available therapies. Other member states allow companies to fix their own prices for medicines, but monitor and control company profits. The downward pressure on health care costs has become very intense. As a result, increasingly high barriers are being erected to the entry of new products. In addition, in some countries, cross-border imports from low-priced markets exert a commercial pressure on pricing within a country.

The marketability of any product candidates for which we receive regulatory approval for commercial sale may suffer if government and other third-party payors fail to provide coverage and adequate reimbursement. We expect downward pressure on pharmaceutical pricing to continue. Further, coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

The advancement of healthcare reform may negatively impact our ability to sell our product candidates, if approved, profitably.

Third-party payors, whether domestic or foreign, or governmental or commercial, are developing increasingly sophisticated methods of controlling healthcare costs. In both the United States and certain foreign jurisdictions, there have been a number of legislative and regulatory changes to the health care system that could impact our ability to sell our product candidates, if approved, profitably. In particular, in 2010 the Affordable Care Act was enacted. The Affordable Care Act and its implementing regulations, among other things, revised the methodology by which rebates owed by

manufacturers to the state and federal government for covered outpatient drugs and certain biologics, including our product candidates, under the Medicaid drug rebate program are calculated, increased the minimum Medicaid rebates owed by most manufacturers under the Medicaid drug rebate program, extended the Medicaid drug rebate program to utilization of prescriptions of individuals enrolled in Medicaid managed care organizations, subjected manufacturers to new annual fees and taxes for certain branded prescription drugs, and provided incentives to programs that increase the federal government's comparative effectiveness research. Additionally, the Affordable Care Act allowed states to implement expanded eligibility criteria for Medicaid programs, imposed a new Medicare Part D coverage gap discount program, expanded the entities eligible for discounts under the Public Health Service pharmaceutical pricing program and implemented a new Patient-Centered Outcomes Research Institute. We are still unsure of the full impact that the Affordable Care Act will have on our business.

Some of the provisions of the Affordable Care Act have yet to be implemented, and there have been legal and political challenges to certain aspects of the Affordable Care Act. Since January 2017, the U.S. President has signed two Executive Orders and other directives designed to delay, circumvent, or loosen certain requirements mandated by the Affordable Care Act. In December 2017, Congress repealed the tax penalty for an individual's failure to maintain Affordable Care Act-mandated health insurance, commonly known as the "individual mandate", as part of the Tax Cuts and Jobs Act of 2017, or the Tax Act. On January 22, 2018, the U.S. President signed a continuing resolution on appropriations for fiscal year 2018 that delayed the implementation of certain Affordable Care Act-mandated fees, including the so-called "Cadillac" tax on certain high cost employer- sponsored insurance plans, the annual fee imposed on certain health insurance providers based on market share, and the medical device excise tax on non-exempt medical devices. The Bipartisan Budget Act of 2018, among other things, amended the Affordable Care Act, effective January 1, 2019, to close the coverage gap in most Medicare drug plans, commonly referred to as the "donut hole". In July 2018, CMS published a final rule permitting further collections and payments to and from certain Affordable Care Act qualified health plans and health insurance issuers under the Affordable Care Act risk adjustment program in response to the outcome of federal district court litigation regarding the method CMS uses to determine this risk adjustment. On December 14, 2018, a Texas U.S. District Court Judge ruled that the Affordable Care Act is unconstitutional in its entirety because the "individual mandate" was repealed by Congress as part of the Tax Act. While the Texas U.S. District Court Judge, as well as the Trump administration and CMS, have stated that the ruling will have no immediate effect pending appeal of the decision, it is unclear how this decision, subsequent appeals, and other efforts to repeal and replace the Affordable Care Act will impact the Affordable Care Act and our business.

Further legislation or regulation could be passed that could harm our business, financial condition and results of operations. Other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. For example, in August 2011, President Obama signed into law the Budget Control Act of 2011, which, among other things, created the Joint Select Committee on Deficit Reduction to recommend to Congress proposals in spending reductions. The Joint Select Committee on Deficit Reduction did not achieve a targeted deficit reduction of at least $1.2 trillion for fiscal years 2012 through 2021, triggering the legislation's automatic reduction to several government programs. This includes aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which went into effect beginning on April 1, 2013 and will stay in effect through 2027, unless additional Congressional action is taken. In January 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to several types of providers, including hospitals, imaging centers and cancer treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at broadening the availability of healthcare and containing or lowering the cost of healthcare. The implementation of cost containment measures or other healthcare reforms

may prevent us from being able to generate revenue, attain profitability, or commercialize our products. Such reforms could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain regulatory approval and may affect our overall financial condition and ability to develop product candidates.

In addition, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have been several recent U.S. Congressional inquiries and federal and state legislative activity designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient assistance programs, and reform government program reimbursement methodologies for drugs. At the federal level, the U.S. President's administration's budget proposal for fiscal year 2019 contains further drug price control measures that could be enacted during the 2019 budget process or in other future legislation, including, for example, measures to permit Medicare Part D plans to negotiate the price of certain drugs under Medicare Part B, to allow some states to negotiate drug prices under Medicaid, and to eliminate cost sharing for generic drugs for low-income patients. Further, the current U.S. President's administration released a "Blueprint", or plan, to lower drug prices and reduce out of pocket costs of drugs that contains additional proposals to increase drug manufacturer competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower the list price of their products, and reduce the out of pocket costs of drug products paid by consumers. The U.S. Department of Health and Human Services, or the HHS, has already started the process of soliciting feedback on some of these measures and, at the same, is immediately implementing others under its existing authority. For example, in September 2018, CMS announced that it will allow Medicare Advantage Plans the option to use step therapy for Part B drugs beginning January 1, 2019, and in October 2018, CMS proposed a rule that would require direct-to-consumer television advertisements of prescription drugs and biological products, for which payment is available through or under Medicare or Medicaid, to include in the advertisement the Wholesale Acquisition Cost, or list price, of that drug or biological product. On January 31, 2019, the HHS Office of Inspector General proposed modifications to federal Anti-Kickback Statute safe harbors which, among other things, may affect rebates paid by manufacturers to Medicare Part D plans, the purpose of which is to further reduce the cost of drug products to consumers. While some of these and other proposed measures may require authorization through additional legislation to become effective, Congress and the current U.S. President's administration have each indicated that it will continue to seek new legislative and/or administrative measures to control drug costs.

Individual states in the United States have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care organizations and other payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors, which may adversely affect our future profitability.

Patents and patent applications involve highly complex legal and factual questions, which, if determined adversely to us, could negatively impact our business position.

The patent positions of biopharmaceutical and biotechnology companies and other actors in our fields of business can be highly uncertain and typically involve complex scientific, legal and factual analyses. In particular, the interpretation and breadth of claims allowed in some patents covering biopharmaceutical compositions may be uncertain and difficult to determine, and are often affected materially by the facts and circumstances that pertain to the patented compositions and the related patent claims. The standards of the United States Patent and Trademark Office (the USPTO) and its foreign counterparts are sometimes uncertain and could change in the future.

Consequently, the issuance and scope of patents cannot be predicted with certainty. Patents, if issued, may be challenged, invalidated or designed around. U.S. patents and patent applications may also be subject to interference or derivation proceedings, and U.S. patents may be subject to reexamination, post-grant review and/ or inter parties review proceedings in the USPTO.

International patents may also be subject to opposition or comparable proceedings in the corresponding international patent office, which could result in either loss of the patent or denial of the patent application, or loss or reduction in the scope of one or more of the claims of the patent or patent application. In addition, such interference, derivation, reexamination, post-grant review, inter parties review and opposition proceedings may be costly. Accordingly, rights under any issued patents may not provide us with sufficient protection against competitive products or processes.

Furthermore, even if not challenged, our patents and patent applications may not adequately protect our technology and any product candidates or products that we develop alone or with collaborators or prevent others from designing their products to avoid being covered by our claims. If the breadth or strength of protection provided by the patents and patent applications that we hold with respect to our product candidates or potential products is threatened, it could dissuade companies from collaborating with us to develop, and could threaten our or their ability to successfully commercialize, such product candidates or potential products.

In addition, changes in, or different interpretations of, patent laws in the United States and other countries may permit others to use our discoveries or to develop and commercialize our technology and product candidates or products without providing any compensation to us, or may limit the scope of patent protection that we are able to obtain. The laws of some countries do not protect intellectual property rights to the same extent as U.S. laws, and those countries may lack adequate rules and procedures for defending our intellectual property rights.

Periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on patents and/or applications will be due to be paid to the USPTO and various governmental patent agencies outside of the United States in several stages over the lifetime of the patents and/or applications. We rely on our outside counsel and employ an outside firm to pay these fees due to USPTO and non-US patent agencies. The USPTO and various non-US governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other similar provisions during the patent application process. Although an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules, there are situations in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, our competitors might be able to enter the market which would have a material adverse effect on our business.

If the patent applications we hold or have in-licensed with respect to our current and future research and development programs and product candidates fail to issue, if their validity, breadth or strength of protection is threatened, or if they fail to provide meaningful exclusivity for our technology or any products and product candidates that we or our collaborators may develop, it could dissuade companies from collaborating with us to develop product candidates, encourage competitors to develop competing products or technologies and threaten our or our collaborators' ability to commercialize future product candidates. Any such outcome could have a material adverse effect on our business.

Our ability to compete effectively in our markets may decline if we do not adequately protect our proprietary rights, and our proprietary rights do not necessarily address all potential threats to our competitive advantages.

We rely on patent protection as well as trademark, trade secret and other intellectual property rights protection and contractual restrictions to protect Diamond, CancerSplice, ABBIE, and ALEXIS and other product candidates. Our commercial success depends upon obtaining and maintaining proprietary rights to our intellectual property estate, including rights relating to Diamond, CancerSplice, ABBIE, and ALEXIS and other product candidates, as well as successfully defending these rights against third-party challenges and successfully enforcing these rights to prevent third-party infringement. We will only be able to protect Diamond, CancerSplice, ABBIE, and ALEXIS and other product candidates from unauthorized use by third parties to the extent that valid and enforceable patents or effectively protected trade secrets cover them.

Our ability to obtain and maintain patent protection for Diamond, CancerSplice, ABBIE, and ALEXIS and other product candidates is uncertain due to a number of factors, including the following factors:

Even if we have or obtain patents covering Diamond, CancerSplice, ABBIE, and ALEXIS or any other product candidates or compositions, others may have filed, and in the future may file, patent applications covering compositions, products or methods that are similar or identical to ours, which could materially affect our ability to successfully develop any product candidates or to successfully commercialize any approved products alone or with collaborators. In addition, because patent applications can take many years to issue, there may be currently pending applications unknown to us that may later result in issued patents that may cover Diamond, CancerSplice, ABBIE, and ALEXIS or any other product candidates or compositions. These patent applications may have priority over patent applications filed by us.

The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, and our owned and licensed patents may be challenged in the courts or patent offices in the United States and abroad. Such challenges may result in loss of exclusivity or freedom to operate or in patent claims being narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to stop others from using or commercializing similar or identical technology and products, or limit the duration of the patent protection of our technology and products.

In the United States, the natural expiration of a patent is generally 20 years after it is filed. Various extensions may be available; however the life of a patent, and the protection it affords, is limited.

Without patent protection for current or future product candidates, we may be open to competition from generic versions of such potential products. Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. As a result, our owned and licensed patent portfolio may not provide us with sufficient rights to exclude others from commercializing products similar or identical to those we or our collaborators may develop.

In addition, we also try to protect our trade secrets, know-how and other proprietary information through non-disclosure and confidentiality provisions in our agreements with parties who have access to them, such as our employees, consultants and research partners. Such agreements may not be enforceable or may not provide meaningful protection for our trade secrets, know-how and/or other proprietary information in the event of unauthorized uses or disclosure or other breaches of the provisions, and we may not be able to prevent such unauthorized uses or disclosure. Moreover, if a party having an agreement with us has an overlapping or conflicting obligation to a third party, our rights in and to certain intellectual property could be undermined. Monitoring unauthorized and inadvertent disclosure and uses is difficult, and we do not know whether the steps we have taken to prevent such disclosure and uses are, or will be, adequate. In addition, monitoring unauthorized disclosure and uses of our trade secrets is difficult, and we do not know whether the steps we have taken to prevent such disclosure and uses are, or will be, adequate. If we were to enforce a claim that a third-party had illegally obtained and was using our trade secrets, it would be expensive and

time-consuming, and the outcome would be unpredictable, and any remedy may be inadequate. In addition, courts outside the United States may be less willing to protect trade secrets.

We rely on trade secrets to protect our proprietary technologies, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We rely in part on confidentiality agreements with our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to protect our trade secrets and other proprietary information. These agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover our trade secrets and proprietary information. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive business position.

Because we may rely on third parties to manufacture our potential product candidates, and because we collaborate with various organizations and academic institutions on the advancement of our current and potential product candidates, we must, at times, share trade secrets with them. We seek to protect our proprietary technology in part by entering into confidentiality agreements and, if applicable, material transfer agreements, collaborative research agreements, consulting agreements or other similar agreements with our manufacturers, collaborators, advisors, employees and consultants prior to beginning research or disclosing proprietary information. These agreements typically limit the rights of the third parties to use or disclose our confidential information, such as trade secrets. Despite the contractual provisions employed when working with third parties, the need to share trade secrets and other confidential information increases the risk that such trade secrets become known by our competitors, are inadvertently incorporated into the technology of others, are used inappropriately to create new inventions or are disclosed or used in violation of these agreements. Given that our proprietary position is based, in part, on our know-how and trade secrets, a competitor's discovery of our trade secrets or other unauthorized use or disclosure would impair our competitive position and may have a material adverse effect on our business.

If we fail to comply with our obligations in the agreements under which we license intellectual property rights from third parties or otherwise experience disruptions to our business relationships with our licensors, we could lose license rights that are important to our business.

We are a party to a number of intellectual property license agreements that are important to our business and expect to enter into additional license agreements in the future. Our existing license agreements impose, and we expect that future license agreements will impose, various diligence, milestone payment, royalty and other obligations on us. Additionally, we may need to outsource and rely on third parties for many aspects of the development, sales and marketing of any products covered under our current and future license agreements. Delay or failure by these third parties could adversely affect the continuation of our license agreements with our licensors. If we fail to comply with any of our obligations under these agreements, or we are subject to a bankruptcy, our licensors may have the right to terminate the license, in which event we would not be able to market any products covered by the license.

In some cases, patent prosecution of our licensed technology is controlled solely by the licensor. If such licensor fails to obtain and maintain patent or other protection for the proprietary intellectual property we license from such licensor, we could lose our rights to such intellectual property or the exclusivity of such rights, and our competitors could market competing products using such intellectual property. In that event, we may be required to expend significant time and resources to develop or license replacement technology.

If we are unable to do so, we or our collaborators may be unable to develop or commercialize the affected product candidates, which could harm our business significantly. In other cases, we control the prosecution of patents resulting from licensed technology. In the event we breach any of our obligations related to such prosecution, we may incur significant liability to our licensing partners.

Licensing of intellectual property is of critical importance to our business and involves complex legal, business and scientific issues and is complicated by the rapid pace of scientific discovery in our industry. Disputes may arise regarding intellectual property subject to a licensing agreement, including:

If disputes over intellectual property that we have licensed prevent or impair our ability to maintain our current licensing arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

If we do not obtain patent term extension in the United States under the Hatch-Waxman Act and in foreign countries under similar legislation with respect to our product candidates, thereby potentially extending the term of marketing exclusivity for such product candidates, our business may be harmed.

In the United States, a patent that covers an FDA-approved drug or biologic may be eligible for a term extension designed to restore the period of the patent term that is lost during the premarket regulatory review process conducted by the FDA. Depending upon the timing, duration and conditions of FDA marketing approval of our product candidates, one or more of our U.S. patents may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, or the Hatch-Waxman Act, which permits a patent term extension of up to five years for a patent covering an approved product as compensation for effective patent term lost during product development and the FDA regulatory review process.

In the European Union, our product candidates may be eligible for term extensions based on similar legislation. In either jurisdiction, however, we may not receive an extension if we fail to apply within applicable deadlines, fail to apply prior to expiration of relevant patents or otherwise fail to satisfy applicable requirements.

Even if we are granted such extension, the duration of such extension may be less than our request. If we are unable to obtain a patent term extension, or if the term of any such extension is less than our request, the period during which we can enforce our patent rights for that product will be in effect shortened and our competitors may obtain approval to market competing products sooner. The resulting reduction of years of revenue from applicable products could be substantial.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some

foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

Third parties may assert claims against us alleging infringement of their patents and proprietary rights, or we may need to become involved in lawsuits to defend or enforce our patents, either of which could result in substantial costs or loss of productivity, delay or prevent the development and commercialization of product candidates, prohibit our use of proprietary technology or sale of potential products or put our patents and other proprietary rights at risk.

Our commercial success depends in part upon our ability to develop, manufacture, market and sell product candidates without alleged or actual infringement, misappropriation or other violation of the patents and proprietary rights of third parties. Litigation relating to infringement or misappropriation of patent and other intellectual property rights in the pharmaceutical, biotechnology is common, including patent infringement lawsuits, and such interference, derivation, reexamination, post-grant review, inter parties review and opposition proceedings before the USPTO and corresponding international patent offices.

The various markets in which we plan to operate are subject to frequent and extensive litigation regarding patents and other intellectual property rights. In addition, many companies in intellectual property-dependent industries, including the biotechnology and pharmaceutical industries, have employed intellectual property litigation as a means to gain an advantage over their competitors.

Numerous United States, EU and other internationally issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we and our collaborators are developing product candidates, and as the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our product candidates may be subject to claims of infringement of the intellectual property rights of third parties.

For example, we are aware of certain patents held by third parties relating to the modification of CAR-T/NK cells, including the production of CAR-T/NK cells. Although conducting clinical trials and other development activities with respect to our CAR-T/NK product candidates is not considered an act of infringement in the United States, if and when any of our CAR-T/NK product candidates are

approved by the FDA, those third parties may seek to enforce their patents by filing a patent infringement lawsuit against us.

As a result of any patent infringement claims, or in order to avoid any potential infringement claims, we may choose to seek, or be required to seek, a license from a third party, which may require payment of substantial royalties or fees, or require us to grant a cross-license under our intellectual property rights.

These licenses may not be available on reasonable terms or at all. Even if a license can be obtained on reasonable terms, the rights may be nonexclusive, which would give our competitors access to the same intellectual property rights. If we are unable to enter into a license on acceptable terms, we or our collaborators could be prevented from commercializing one or more product candidates, or forced to modify such product candidates, or to cease some aspect of our business operations, which could harm our business significantly.

We or our collaborators might also be forced to redesign or modify our technology or product candidates so that we no longer infringe the third-party intellectual property rights, which may result in significant cost or delay to us, or which redesign or modification could be impossible or technically infeasible. Even if we were ultimately to prevail, any of these events could require us to divert substantial financial and management resources that we would otherwise be able to devote to our business.

Further, if a patent infringement suit is brought against us, our collaborators or our third-party service providers, our development, manufacturing or sales activities relating to the product or product candidate that is the subject of the suit may be delayed or terminated. In addition, defending such claims has in the past and may in the future cause us to incur substantial expenses and, if successful, could cause us to pay substantial damages if we are found to be infringing a third party's patent rights.

These damages potentially include increased damages and attorneys' fees if we are found to have infringed such rights willfully. Some claimants may have substantially greater resources than we do and may be able to sustain the costs of complex intellectual property litigation to a greater degree and for longer periods of time than we could. In addition, patent holding companies that focus solely on extracting royalties and settlements by enforcing patent rights may target us.

We have been and may in the future be subject to third-party claims and similar adversarial proceedings or litigation in other jurisdictions regarding our infringement of the patent rights of third parties. Even if such claims are without merit, a court of competent jurisdiction could hold that these third-party patents are valid, enforceable and infringed, and the holders of any such patents may be able to block our or our collaborators' ability to further develop or commercialize the applicable product candidate unless we obtain a license under the applicable patents, or until such patents expire or are finally determined to be invalid or unenforceable.

Similarly, if any third-party patents were held by a court of competent jurisdiction to cover aspects of our technologies, compositions, formulations, or methods of treatment, prevention or use, the holders of any such patents may be able to prohibit our use of those technologies, compositions, formulations, methods of treatment, prevention or use or other technologies, effectively blocking our or our collaborators' ability to develop and commercialize the applicable product candidate until such patent expires or is finally determined to be invalid or unenforceable or unless we or our collaborators obtain a license.

Competitors may infringe our patents. In the event of infringement or unauthorized use, we may file one or more infringement lawsuits, which can be expensive and time-consuming. An adverse result in any such litigation proceedings could put one or more of our patents at risk of being invalidated, being found to be unenforceable, and/or being interpreted narrowly and could put our patent applications at risk of not issuing and/or could impact the validity or enforceability positions of our other patents.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

Some of our competitors may be able to sustain the costs of complex intellectual property litigation more effectively than we can because they have substantially greater resources. In addition, intellectual property litigation, regardless of its outcome, may cause negative publicity, adversely impact prospective customers, cause product shipment delays or prohibit us from manufacturing, marketing or otherwise commercializing our products, services and technology.

Any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to raise additional funds or otherwise have a material adverse effect on our business, results of operation, financial condition or cash flows.

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our products.

The United States has enacted and is currently implementing wide-ranging patent reform legislation. Recent U.S. Supreme Court rulings have narrowed the scope of patent protection available in certain circumstances and weakened the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts and the U.S. PTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to enforce our existing patents and patents that we might obtain in the future.

We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of third parties or that our employees have wrongfully used or disclosed alleged trade secrets of their former employers.

We may now and in the future employ individuals who were previously employed at universities or other biotechnology or pharmaceutical companies, including our competitors or potential competitors. We may be subject to claims that we or our employees, consultants or independent contractors have inadvertently or otherwise used or disclosed intellectual property, including trade secrets or other proprietary information, of any of our employee's former employer or other third parties. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel, which could adversely impact our business. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management and other employees.

Our Company's governing documents designate the Court of Chancery of the State of Delaware as the sole and exclusive forum for certain types of state law actions and proceedings that may be initiated by our stockholders, which could limit our stockholders' ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or agents.

Our Fourth Amended and Restated Certificate of Incorporation, which will be effective immediately prior to the closing of this offering, dictates that the Delaware Court of Chancery is the sole and exclusive forum for certain state law based actions including certain derivative actions or proceedings brought on behalf of us; an action asserting a breach of fiduciary duty owed by an officer, a director, employee or to our shareholders; any claim arising under Delaware corporate law; and any action asserting a claim governed by the internal affairs doctrine.

This exclusive forum provision does not apply to suits brought to enforce any liability or duty created by the Securities Act or the Exchange Act or other federal securities laws for which there is exclusive federal or concurrent federal and state jurisdiction.

This choice of forum provision may limit our stockholders' ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers, employees or agents, which may discourage such lawsuits against us and our directors, officers, employees and agents even though an action, if successful, might benefit our stockholders. Stockholders who do bring a claim in the Court of Chancery could face additional litigation costs in pursuing any such claim, particularly if they do not reside in or near Delaware. The Court of Chancery may also reach different judgments or results than would other courts, including courts where a stockholder considering an action may be located or would otherwise choose to bring the action, and such judgments or results may be more favorable to us than to our stockholders. Alternatively, if a court were to find this provision inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could have a material adverse effect on our business, financial condition or results of operations.

Our common stock may be volatile or may decline regardless of our operating performance, and you may not be able to resell your shares at or above the initial public offering price.

After this offering, the market price for our common stock is likely to be volatile, in part because our shares have not been traded publicly. In addition, the market price of our common stock may fluctuate significantly in response to several factors, most of which we cannot control, including:

The public offering price of our common stock has been determined by us based upon many factors and may not be indicative of prices that will prevail following the closing of this offering. Volatility in the market price of our common stock may prevent investors from being able to sell their shares at or above the initial public offering price. As a result, you may suffer a loss on your investment.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, the market price for the shares and trading volume could decline.

The trading market for our common stock will depend in part on the research and reports that securities or industry analysts publish about us or our business. If research analysts do not establish and maintain adequate research coverage or if one or more of the analysts who covers us downgrades our common stock or publishes inaccurate or unfavorable research about our business, the market price for our common stock would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, we could lose visibility in the financial markets, which, in turn, could cause the market price or trading volume for our common stock to decline.

As our initial public offering price is substantially higher than our net tangible book value per share, you will experience immediate and substantial dilution.

If you purchase shares in this offering, you will pay more for your shares of common stock than the amount paid by our existing stockholders for their shares on a per share basis. As a result, you will experience immediate and substantial dilution in net tangible book value per share in relation to the price that you paid for your shares. We expect the dilution as a result of the offering to be $9.49 per share to new investors purchasing our shares in this offering. In addition, you will experience further dilution to the extent that our shares are issued upon the exercise of any warrants or exercise of stock options under any stock incentive plans. See "Dilution" for a more complete description of how the value of your investment in our shares will be diluted upon completion of this offering.

We have considerable discretion as to the use of the net proceeds from this offering and we may use these proceeds in ways with which you may not agree.

We intend to the proceeds from this offering primarily for the clinical trials for our ALEXIS Isoform Mesothelin EOC and PD-1 product candidates, intellectual property protection and reinforcement, IND applications and IND enabling trials and working capital and general corporate purposes. However, we have considerable discretion in the application of the proceeds. You will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. You must rely on the judgment of our management regarding the application of the net proceeds of this offering. The net proceeds may be used for corporate or other purposes with which you do not agree or that do not improve our profitability or increase our share price. The net proceeds from this offering may also be placed in investments that do not produce income or that lose value.

We do not expect to pay dividends in the foreseeable future after this offering, and you must rely on price appreciation of your shares for return on your investment.

We have paid no cash dividends on any class of our stock to date and we do not anticipate paying cash dividends in the near term. For the foreseeable future, we intend to retain any earnings to finance the development and expansion of our business, and we do not anticipate paying any cash dividends on our stock. Accordingly, investors must be prepared to rely on sales of their shares after price appreciation to earn an investment return, which may never occur. Investors seeking cash dividends should not purchase our shares. Any determination to pay dividends in the future will be made at the discretion of our board of directors and will depend on our results of operations, financial condition, contractual restrictions, restrictions imposed by applicable law and other factors our board deems relevant.

We may issue additional debt and equity securities, which are senior to our common stock as to distributions and in liquidation, which could materially adversely affect the market price of our common stock.

In the future, we may attempt to increase our capital resources by entering into additional debt or debt-like financing that is secured by all or up to all of our assets, or issuing debt or equity securities,

which could include issuances of commercial paper, medium-term notes, senior notes, subordinated notes or shares. In the event of our liquidation, our lenders and holders of our debt securities would receive a distribution of our available assets before distributions to our stockholders. In addition, any additional preferred stock, if issued by our company, may have a preference with respect to distributions and upon liquidation, which could further limit our ability to make distributions to our stockholders. Because our decision to incur debt and issue securities in our future offerings will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our future offerings and debt financing.

Further, market conditions could require us to accept less favorable terms for the issuance of our securities in the future. Thus, you will bear the risk of our future offerings reducing the value of your common stock and diluting your interest in our company.

We will be subject to ongoing public reporting requirements that are less rigorous than Exchange Act rules for companies that are not emerging growth companies and our stockholders could receive less information than they might expect to receive from more mature public companies.

Upon the completion of this offering, we will be required to publicly report on an ongoing basis as an "emerging growth company" (as defined in the JOBS Act) under the reporting rules set forth under the Exchange Act. For so long as we remain an emerging growth company, we may take advantage of certain exemptions from various reporting requirements that are applicable to other Exchange Act reporting companies that are not emerging growth companies, including but not limited to:

In addition, Section 107 of the JOBS Act also provides that an emerging growth company can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act for complying with new or revised accounting standards. In other words, an emerging growth company can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected to take advantage of the benefits of this extended transition period. Our financial statements may therefore not be comparable to those of companies that comply with such new or revised accounting standards.

We expect to take advantage of these reporting exemptions until we are no longer an emerging growth company. We would remain an emerging growth company for up to five years from the date of the first sale of equity securities pursuant to an effective registration statement, although if the market value of our common stock that is held by non-affiliates exceeds $700 million as of any June 30 before that time, we would cease to be an emerging growth company as of the following December 31.

Because we will be subject to ongoing public reporting requirements that are less rigorous than Exchange Act rules for companies that are not emerging growth companies, our stockholders could receive less information than they might expect to receive from more mature public companies. We cannot predict if investors will find our common stock less attractive if we elect to rely on these exemptions, or if taking advantage of these exemptions would result in less active trading or more volatility in the price of our common stock.

Raising additional capital may cause dilution to our stockholders, including purchasers of common stock in this offering, restrict our operations or require us to relinquish rights to our technologies or product candidates.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity and/or debt financings and collaborations, licensing agreements or other strategic arrangements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest will be diluted, and the terms of such securities may include liquidation or other preferences that adversely affect your rights as a common stockholder.

To the extent that we raise additional capital through debt financing, it would result in increased fixed payment obligations and a portion of our operating cash flows, if any, being dedicated to the payment of principal and interest on such indebtedness. In addition, debt financing may involve agreements that include restrictive covenants that impose operating restrictions, such as restrictions on the incurrence of additional debt, the making of certain capital expenditures or the declaration of dividends.

To the extent we raise additional capital through arrangements with collaborators or otherwise, we may be required to relinquish some of our technologies, research programs, product development activities, product candidates and/or future revenue streams, license our technologies and/or product candidates on unfavorable terms or otherwise agree to terms unfavorable to us. Furthermore, any capital raising efforts may divert our management from their day-to-day activities, which may adversely affect our ability to advance research programs, product development activities or product candidates.

This prospectus contains forward-looking statements that are based on our management's beliefs and assumptions and on information currently available to us. All statements other than statements of historical facts are forward-looking statements. The forward-looking statements are contained principally in, but not limited to, the sections entitled "Prospectus Summary," "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Business." These statements relate to future events or to our future financial performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

In some cases, you can identify forward-looking statements by terms such as "may," "could," "will," "should," "would," "expect," "plan," "intend," "anticipate," "believe," "estimate," "predict," "potential," "project" or "continue" or the negative of these terms or other comparable terminology. These statements are only predictions. You should not place undue reliance on forward-looking statements because they involve known and unknown risks, uncertainties and other factors, which are, in some cases, beyond our control and which could materially affect results. Factors that may cause actual results to differ materially from current expectations include, among other things, those listed under the heading "Risk Factors" and elsewhere in this prospectus. If one or more of these risks or uncertainties occur, or if our underlying assumptions prove to be incorrect, actual events or results may vary significantly from those implied or projected by the forward-looking statements. No forward-looking statement is a guarantee of future performance.

This prospectus also contains certain data and information, which we obtained from various government and private publications. Although we believe that the publications and reports are reliable, we have not independently verified the data. Statistical data in these publications includes projections that are based on a number of assumptions. If any one or more of the assumptions underlying the market data is later found to be incorrect, actual results may differ from the projections based on these assumptions.

The forward-looking statements made in this prospectus relate only to events or information as of the date on which the statements are made in this prospectus. Although we will become a public company after this offering and have ongoing disclosure obligations under United States federal securities laws, we do not intend to update or otherwise revise the forward-looking statements in this prospectus, whether as a result of new information, future events or otherwise.

We estimate that the net proceeds from the sale of the 1,923,100 shares of common stock that we are selling in this offering will be approximately $21,963,000, or approximately $25,394,300 if the underwriters exercise their over-allotment option in full, and after deducting estimated underwriting discounts and commissions and our estimated offering expenses based on an assumed initial public offering price of $13.00 per share (the midpoint of the price range set forth on the cover of this prospectus).

We plan to use the net proceeds of this offering for (i) the initiation clinical trials for our ALEXIS Isoform Mesothelin EOC and PD-1 product candidates (approximately $10,488,000), (ii) intellectual property protection and reinforcement (approximately $381,000), and the remainder for (iii) working capital and general corporate purposes.

With anticipated net proceeds of $21,963,000, we believe we will complete approximately 48.0% of the clinical trials using ALEXIS Isoform Mesothelin and PD-1 for EOC.

We may also use a portion of the net proceeds of this offering to acquire or invest in complementary businesses, products, or technologies, or to obtain the right to use such complementary technologies. We have no commitments with respect to any acquisition or investment, and we are not currently involved in any negotiations with respect to any such transaction.

As of the date of this prospectus, we cannot specify with certainty all of the particular uses for the net proceeds to be received upon the completion of this offering. The amounts and timing of our actual expenditures will depend on numerous factors, including the status of our product development efforts, sales and marketing activities, technological advances, amount of cash generated or used by our operations and competition. Accordingly, our management will have broad discretion in the application of the net proceeds and investors will be relying on the judgment of our management regarding the application of the proceeds of this offering.

Pending use of the proceeds from this offering as described above, we intend to invest the net proceeds of this offering in short-term, interest-bearing, investment-grade securities or certificates of deposit.

We have never declared or paid cash dividends on our common stock. We currently intend to retain all available funds and any future earnings for use in the operation of our business and do not anticipate paying any cash dividends on our common stock in the near future. See also "Risk Factors—Risks Related to this Offering and the Market for Our Common Stock—Because we do not expect to pay dividends in the foreseeable future after this offering, you must rely on price appreciation of your shares for return on your investment." We may enter into credit agreements or other borrowing arrangements in the future that will restrict our ability to declare or pay cash dividends on our common stock.

Any future determination to declare dividends will be made at the discretion of our board of directors and will depend on our financial condition, operating results, capital requirements, contractual restrictions, general business conditions and other factors that our board of directors may deem relevant.

You should read this table together with our consolidated financial statements, the related notes included elsewhere in this prospectus and the information under "Management's Discussion and Analysis of Financial Condition and Results of Operations."

	June 30, 2020

	Actual			As adjusted
Cash and cash equivalents	$	1,683,500		$	25,771,500
Long-term debt		—			—
Stockholders' equity:
Series A-1 Preferred Stock		9,134,700			—
Series B Preferred Stock		2,331,300			—
Common Stock		—			—
Additional paid-in capital		26,276,500			61,830,500
Accumulated deficit		(35,647,200	)		(35,647,200	)
Total stockholders' equity		2,095,300			26,183,300
Total capitalization		2,095,300			26,183,300

Each $1.00 increase (decrease) in the assumed initial public offering price of $13.00 per share, the midpoint of the price range listed on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents, working capital, total assets and total stockholders' equity by approximately $1,923,100, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. Similarly, each increase (decrease) of 100,000 shares in the number of shares offered by us at the assumed initial public offering price of $13.00 per share, the midpoint of the price range listed on the cover page of this prospectus, would increase (decrease) the pro forma as adjusted amount of each of cash and cash equivalents, working capital, total assets and total stockholders' equity by approximately $1,300,000.

If you purchase shares of our common stock in this offering, your interest will be diluted to the extent of the difference between the initial public offering price per share and our net tangible book value per share after this offering. Dilution results from the fact that the assumed initial public offering price per share is substantially in excess of the net tangible book value per share attributable to the existing stockholders for our presently outstanding common stock.

Our net tangible book value was approximately $1,992,800 or $0.40 per share, as of June 30, 2020. Our net tangible book value represents the amount of our total consolidated tangible assets (which is calculated by subtracting net intangible assets, deferred tax assets, and prepaid offering expenses from our total consolidated assets), less the amount of our total consolidated liabilities.

After giving effect to (i) the Preferred Stock Automatic Conversions and (ii) the sale and issuance by us of 1,923,100 shares of common stock in this offering at the assumed initial public offering price of $13.00 per share, (the midpoint of the price range as set forth on the cover page of this prospectus), after deducting underwriting discounts and commissions and estimated offering expenses payable by us, our as adjusted net tangible book value as of June 30, 2020 would have been $26,080,800 or $3.26 per share. This represents an immediate increase in net tangible book value of $3.26 per share to our existing stockholders, and an immediate dilution in net tangible book value of $9.74 per share to new investors. The following table illustrates this per share dilution:

If the underwriters' over-allotment option is exercised in full, our pro forma, as adjusted net tangible book value per share after this offering would be $3.60 and dilution per share to new investors purchasing common stock in this offering would be $9.40 at the assumed initial public offering price of $13.00 per share, (the midpoint of the price range as set forth on the cover page of this prospectus) and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us.

The as adjusted information discussed above is illustrative only. Our net tangible book value following the completion of this offering is subject to adjustment based on the actual initial public offering price of our shares and other terms of this offering determined at pricing.

The following tables summarize the differences between our existing stockholders and the investors purchasing shares in this offering with respect to the number of shares purchased from us, the total consideration paid and the average price per share paid, at the assumed initial public offering price of $13.00 per share, (the midpoint of the price range as set forth on the cover page of this prospectus) before deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us.

The number of shares outstanding is based on shares outstanding as of August 24, 2020 and except as noted above, excludes the following currently outstanding securities:

The table above assumes no exercise of the underwriters' over-allotment option. If the underwriters' over-allotment option is exercised in full, upon completion of this offering, the percentage of common stock held by existing common stockholders would be reduced to 60.15%, and the percentage of common stock held by new investors purchasing common stock in this offering would be increased to 26.66%.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion together with our financial statements and the related notes included elsewhere in this prospectus. This discussion contains forward-looking statements that are based on our current expectations, estimates and projections about our business and operations. Our actual results may differ materially from those currently anticipated and expressed in such forward-looking statements as a result of a number of factors, including those which we discuss under "Risk Factors" and elsewhere in this prospectus. See "Special Note Regarding Forward-Looking Statements."

We are a pre-clinical stage immuno-oncology, target discovery and gene editing company developing tumor-specific cancer engineered immunotherapies to face and defeat multiple cancer types. We are focused on extending the benefits of immunotherapy by leveraging our proprietary technologies. Our approach seeks to generate a therapeutic immune response in patients by unleashing the demonstrated natural power of a patient's own immune system to recognize tumor-specific peptide sequences presented on cancer cells, known as tumor specific iso-antigens, capable of generating an immunological response and therefore eradicate cancer cells. We are developing our brand of CAR T cell product candidates known as ALEXIS. These are designed to treat cancer by capitalizing on the immune system's ability to destroy cancer cells. These products are in the pre-IND stage. We are currently going through the IND validation process and we expect that IND enabling trials will commence in the second half of 2020.

CAR T cell therapy, a form of cancer immunotherapy, has recently emerged as a revolutionary and potentially curative therapy for patients with hematologic cancers, including refractory cancers. In 2017, two autologous anti-CD19 CAR T cell therapies, Kymriah, developed by Novartis International AG, and Yescarta, developed by Kite Pharma, Inc., were approved by the FDA for the treatment of relapsing/remitting B-cell precursor acute lymphoblastic leukemia and relapsing/remitting large B cell lymphoma, respectively. Autologous CAR T cell therapies are manufactured individually for the patient's use by modifying the patient's own T cells outside the body, causing the T cells to express CARs. The entire manufacturing process is dependent on the viability of each patient's T cells and takes approximately two to four weeks. Allogenic T cell therapies involve engineering healthy donor T cells, which we believe will allow for the creation of an inventory of off-the-shelf products that can be delivered to a larger portion of eligible patients throughout the world.

We are subject to risks and uncertainties as a result of the COVID-19 pandemic. The extent of the impact of the COVID-19 pandemic on our business is highly uncertain and difficult to predict, as the responses that we, other businesses and governments are taking continue to evolve. Furthermore, capital markets and economies worldwide have also been negatively impacted by the COVID-19 pandemic, and it is possible that it could cause a local and/or global economic recession. Policymakers around the globe have responded with fiscal policy actions to support the healthcare industry and economy as a whole. The magnitude and overall effectiveness of these actions remain uncertain.

The severity of the impact of the COVID-19 pandemic on our business will depend on a number of factors, including, but not limited to, the duration and severity of the pandemic and the extent and severity of the impact on the Company's service providers, suppliers, contract research organizations

and our clinical trials, all of which are uncertain and cannot be predicted. As of the date of this filing, the extent to which the COVID-19 pandemic may in the future materially impact our financial condition, liquidity or results of operations is uncertain.

As of the date of the audit report on our 2019 financial statements, conditions and events existed that raised substantial doubt with respect to the going concern assumption on the financial statements. Based on proceeds obtained from the Series B Preferred Stock round of financing and our plans to reduce discretionary spending, management projected it would have sufficient cash to support operations through at least April 7, 2021. As a result, the Company concluded that management's plans were probable of being implemented and alleviated substantial doubt about its ability to continue as a going concern.

After considering the registration statement filing date of August 24, 2020, management extended its consideration of the going concern assumption through August 24, 2021. Management's plans were updated to further finance operations through additional equity or debt financing arrangements, and/or third party collaboration funding; however, if the Company is unable to raise additional funding to meet its working capital needs, it will be forced to delay or reduce the scope of its research programs and/or limit or cease its operations. The negative cash flows and lack of financial resources of the Company raise substantial doubt as to the Company's ability to continue as a going concern.

Upon the completion of this offering, we will qualify as an "emerging growth company" under the JOBS Act. As a result, we will be permitted to, and intend to, rely on exemptions from certain disclosure requirements. For so long as we are an emerging growth company, we will not be required to:

In addition, Section 107 of the JOBS Act also provides that an emerging growth company can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act for complying with new or revised accounting standards. In other words, an emerging growth company can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected to take advantage of the benefits of this extended transition period. Our financial statements may therefore not be comparable to those of companies that comply with such new or revised accounting standards.

We will remain an emerging growth company for up to five years, or until the earliest of (i) the last day of the first fiscal year in which our total annual gross revenues exceed $1.07 billion, (ii) the date that we become a "large accelerated filer" as defined in Rule 12b-2 under the Exchange Act, which would occur if the market value of our common stock that is held by non-affiliates exceeds $700 million as of the last business day of our most recently completed second fiscal quarter or (iii) the date on which we have issued more than $1 billion in non-convertible debt during the preceding three year period.

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from product sales in the foreseeable future. We will record revenue from collaboration agreements, including amounts related to upfront payments, annual fees for licenses of our intellectual property and research and development funding.

Research and development expenses consist primarily of costs incurred for our research activities, including our discovery efforts and the development of our product candidates. These include the following:

Research and development activities are central to our business model. We expect that our research and development expenses will continue to increase substantially for the foreseeable future and will comprise a larger percentage of our total expenses as we initiate a Phase 1/2a clinical trial for our ALEXIS AIDT-1 and Isomesothelin product candidates and continue to discover and develop additional product candidates.

We cannot determine with certainty the duration and costs of future clinical trials of our ALEXIS AIDT-1 product candidate or any other product candidate we may develop or if, when or to what extent we will generate revenue from the commercialization and sale of any product candidate for which we obtain marketing approval. We may never succeed in obtaining marketing approval for any product candidate. The duration, costs and timing of clinical trials and development of our ALEXIS AIDT-1 product candidate and any other our product candidate we may develop will depend on a variety of factors, including:

A change in the outcome of any of these variables with respect to the development of a product candidate could mean a significant change in the costs and timing associated with the development of that product candidate. For example, if the FDA or another regulatory authority were to require us to conduct clinical trials beyond those that we anticipate will be required for the completion of clinical development of a product candidate, or if we experience significant delays in our clinical trials due to slower than expected patient enrollment or other reasons, we would be required to expend significant additional financial resources and time on the completion of clinical development.

General and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation, for personnel in our executive, finance, business development, operations and administrative functions. General and administrative expenses also include legal fees relating to intellectual property and corporate matters; professional fees for accounting, auditing, tax and consulting services; insurance costs; travel expenses; and facility-related expenses, which include direct depreciation costs and expenses for rent and maintenance of facilities and other operating costs that are not specifically attributable to research activities.

We expect that our general and administrative expenses will increase in the future as we increase our personnel headcount to support our continued research activities and development of product candidates. Following this offering, we also expect to incur increased expenses associated with being a public company, including costs of accounting, audit, legal, regulatory and tax-related services associated with maintaining compliance with Nasdaq and SEC requirements; director and officer insurance costs; and investor and public relations costs.

The following table sets forth key components of our results of operations for the six months ended June 30, 2020 and 2019.

	Six Months Ended June 30,						Increase (Decrease)

	2020			2019			$			%
Operating expenses:
Research and development	$	2,300,400		$	329,400		$	1,971,000			598.36	%
General and administrative		10,919,200			326,900			10,592,300			3,240.23	%

Total operating expenses		13,219,600			656,300			12,563,300			1,914.26	%

Loss from operations		(13,219,600	)		(656,300	)		12,563,300			1,914.26	%
Other expense
Interest expense		—			(15,000	)		(15,000	)		(100.00	)%

Total other expense		—			(15,000	)		(15,000	)		(100.00	)%

Net loss	$	(13,219,600	)	$	(671,300	)	$	12,548,300			1,869.25	%

	Six Months Ended June 30,				Increase (Decrease)

	2020		2019		$			%
Direct research and development expenses by product candidate:
AIDT-1 external development costs	$	3,000	$	20,100	$	(17,100	)		(85.07	)%
Isomesothelin external development costs		45,500		—		45,500			100.00	%
Platform development, early-stage research and unallocated expenses:
Employee-related costs		1,127,100		63,700		1,063,400			1,669.39	%
Laboratory supplies and services		133,800		45,200		88,600			196.02	%
Outsourced research and development		664,300		142,500		521,800			366.18	%
Laboratory equipment and maintenance		27,300		—		27,300			100.00	%
Facility-related costs		177,900		57,600		120,300			208.85	%
Other research and development costs		121,500		300		121,200			n/m

Total research and development expenses	$	2,300,400	$	329,400	$	1,971,000			598.36	%

As illustrated above, the increase in research and development expenses resulted from (i) a $1,063,400 increase in employee related costs, which primarily included a $589,900 increase in wages, benefits and payroll taxes and a $459,400 increase in stock compensation expenses attributable to research and development employees; (ii) a $521,800 increase in outsourced research and development costs, which primarily included a $214,800 increase in research studies and other consulting fees along with a $307,000 increase in stock compensation expenses attributable to non-employees; (iii) a $120,300 increase in facility-related costs, primarily driven by a $95,400 increase in allocated rent net of granting agency reimbursements, and a $26,200 increase in allocated depreciation expenses with the remaining offsetting amount attributed to repairs, maintenance, and utilities; (iv) a $121,200 increase in other research and development costs, which were driven by intellectual property legal expenses and intellectual property filings; (v) a $88,600 increase in laboratory supplies in services, which primarily included a $89,000 increase in spending on disposables and consumables for in-vitro testing and validation of pipeline candidates, offset by $400 of reduced supplies spending; (vi) a $27,300 increase in laboratory equipment and maintenance, driven entirely by new non-capitalizable equipment purchases and maintenance to support in-vitro testing and validation by our research and development scientists.

These cost increases discussed were primarily incurred to support in-vitro testing and validation of our product candidates.

The cost increases were also partially due to the difference in grant reimbursements in the six months ended June 30, 2020 and 2019. In August 2018, the National Institute of Health (NIH), the primary agency of the United States government responsible for biomedical and public health research, awarded a Phase I/II grant in the amount of $2,235,000 for the development and non-clinical testing of a new anti-arteriosclerosis gene therapy delivered by engineered adeno-associated viral vectors. Phase I of the grant approved amounts of $851,000 and which covers the period September 2018 through August 2019, entitles us to reimbursement for certain salaries and wages, materials and supplies, facilities and administrative costs, and fixed fees. Starting in 2020, Phase II of the grant covers reimbursements for certain salaries and wages, materials and supplies, facilities and administrative costs, and fixed fees of $1,384,000. During the six months ended June 30, 2020 and 2019, we recognized $0 and $188,300, respectively, as reductions to research and development expense within the statements of operations pursuant to the grant from the NIH.

General and administrative expenses. Our general and administrative expenses increased by $10,592,300, or 3,240.23%, to $10,919,200 for the six months ended June 30, 2020 from $326,900 for the six months ended June 30, 2019. The increase primarily resulted from an increase in stock compensation expenses of $9,355,600, an increase in corporate finance and development expenses of $579,500, a $318,100 increase in professional services costs, and $230,300 of increased employee related expenses.

The increase in stock compensation expense was primarily driven by common stock issuances of 725,536 shares to our Chief Financial Officer, Chief Strategy and Innovation Officer, Chief Medical Officer, and another employee in exchange for services rendered totaling $9,432,000. The increase in corporate finance and development expenses are driven by consulting fees owed to our Chief Scientific and Innovation Officer and Chief Financial Officer. The increase in professional fees and legal expense were primarily driven by increased accounting expenses from auditing, and tax services.

Employee related expenses were impacted by increases to headcount and employee salary rates. During the six months ended June 30, 2020 and 2019, the headcount for employees allocated to general and administrative purposes increased to 4 employees from 3 employees, respectively. In addition, the Chief Executive Officer's salary increased to an annual rate of $380,000 from $280,000 for the six months ended June 30, 2020 and 2019, respectively.

Interest expense. Interest expense decreased by $15,000, to $0 for the six months ended June 30, 2020 from $15,000 for the six months ended June 30, 2019. The decrease is driven by the variance in the balance of convertible promissory notes during the six months ended June 30, 2020 and 2019.

During the six months ended June 30, 2019, we issued an additional $250,000 convertible promissory notes. In addition, in May 2019, the issued notes accrued interest at a rate of 17% per annum. Additionally, the Company settled an accounts payable with a vendor by issuing a convertible promissory note in the amount of $134,800 which accrued interest at a rate of 6% per annum. Total interest expense accrued on the notes in the six months ended June 30, 2019 totaled $15,000. On August 15, 2019, each holder of convertible promissory notes issued during 2019 agreed to voluntarily convert the amounts of principal and interest then outstanding into shares of Series A-1 Preferred Stock. See "—Liquidity and Capital Resources" below for more information.

Net loss. As a result of the cumulative effect of the factors described above, our net loss increased to $13,219,600 during the six months ended June 30, 2020 compared to $671,300 during the six months ended June 30, 2019.

The following table sets forth key components of our results of operations for the years ended December 31, 2019 and 2018.

	Years Ended December 31,						Increase (Decrease)

	2019			2018			$			%
Operating expenses:
Research and development	$	1,201,700		$	1,424,900		$	(223,200	)		(15.66	)%
General and administrative		2,503,700			1,757,700			746,000			42.44	%

Total operating expenses		3,705,400			3,182,600			522,800			16.43	%

Loss from operations		(3,705,400	)		(3,182,600	)		522,800			16.43	%
Other expense
Interest expense		(22,500	)		(633,100	)		(610,600	)		(96.45	)%

Total other expense		(22,500	)		(633,100	)		(610,600	)		(96.45	)%

Net loss	$	(3,727,900	)	$	(3,815,700	)	$	(87,800	)		(2.30	)%

Research and development expenses. Our research and development expenses decreased by $223,200, or 15.66%, to $1,201,700 for the year ended December 31, 2019 from $1,424,900 for the year ended December 31, 2018. The following table summarizes our research and development expenses by product candidate or development program:

	Years Ended December 31,				Increase (Decrease)

	2019		2018		$			%
Direct research and development expenses by product candidate:
AIDT-1 external development costs	$	66,900	$	3,900	$	63,000			1,615.38	%
Platform development, early-stage research and unallocated expenses:
Employee-related costs		574,300		615,600		(41,300	)		(6.71	)%
Laboratory supplies and services		167,600		85,000		82,600			97.18	%
Outsourced research and development		321,700		609,200		(287,500	)		(47.19	)%
Laboratory equipment and maintenance		17,100		6,400		10,700			167.19	%
Facility-related costs		40,700		103,200		(62,500	)		(60.56	)%
Other research and development costs		13,400		1,600		11,800			737.50	%

Total research and development expenses	$	1,201,700	$	1,424,900	$	(223,200	)		(15.66	)%

As illustrated above, the decrease in research and development expenses resulted from (i) a $287,500 decrease in outsourced research and development costs, which primarily included a $273,600 decrease in data administration fees, (ii) a $41,300 decrease in employee related costs driven primarily by reimbursements from granting agencies of $26,500 and reimbursements of social security payroll tax credits totaling $15,100 (ii) a $62,500 decrease in facility-related costs, primarily driven by a $52,700 decrease in clinical trials facility fees. These decreases were as a result of management concluding initial clinical trials testing in May 2019, which halted almost all expenses related to drug manufacturing and data administration that was associated with clinical trials. We also significantly reduced our research and development facility-related costs by obtaining a grant from the National Institute of Health (NIH). In August 2018, NIH, the primary agency of the United States government responsible for biomedical and public health research, awarded a Phase I/II grant in the amount of $2,235,000 for the development and non-clinical testing of a new anti-arteriosclerosis gene therapy delivered by engineered adeno-associated viral vectors. Phase I of the grant approved amounts of $851,000 and which covers the period September 2018 through August 2019, entitles us to reimbursement for certain salaries and wages, materials and supplies, facilities and administrative costs, and fixed fees. Starting in 2020, Phase II of the grant covers reimbursements for certain salaries and wages, materials and supplies, facilities and administrative costs, and fixed fees of $1,384,000. During the years ended December 31, 2019 and 2018, we recognized $298,000 and $258,000, respectively, as reductions to research and development expense within the statements of operations pursuant to the grant from the NIH.

Those reductions were offset by a (i) $63,000 increase in AIDT-1 external development costs, primarily driven by increased spending on disposables and consumables attributable to AIDT-1; and (ii) a $82,600 increase in laboratory supplies and services, primarily driven by a $110,800 increase in disposables and consumables used for experimentation and validation, offset by reduced spending on supplies of $41,100 and reduced shipping, and postage costs. During 2019, we began in vitro testing and validation of our ABBIE delivery vehicle. Thus, higher laboratory supply costs and services were incurred.

General and administrative expenses. Our general and administrative expenses increased by $746,000, or 42.44%, to $2,503,700 for the year ended December 31, 2019 from $1,757,700 for the year ended December 31, 2018. The increase primarily resulted from an increase in professional services related expenses of $873,100, a $387,700 increase in corporate finance and development costs, and increased travel expenses of $34,100. These increases were offset by decreased employee related expenses of $354,200 from wages salaries and benefits and $112,000 reduced expenses from stock based compensation. Additionally, there were decreases of $32,800 from reduced intellectual property administrative expenses, and a $13,600 reduction to professional development costs. The remaining expense increases totaling $3,900 are associated with activities such as, supplies, and other costs associated with our business development.

The increase in professional fees was primarily driven by increased accounting expenses from auditing, tax, and accounting consulting fees to complete SEC filings that had previously not been required by us. Corporate development costs increases were directly related to corporate's legal counsel, SEC filing costs, and increased executive consulting fees compared to prior year. Increased travel expenses were incurred to attend medical conferences, and meetings with potential underwriters and market makers.

The reduction in wages and benefits was primarily driven a reduction in headcount expenses allocated to general and administrative expense January 1, 2018 and December 31, 2019. During those 24 months, headcount allocated to general and administrative expense decreased from 7 employees to 2 employees. Average headcount allocated to general and administrative activity in the years ended December 31, 2019 and 2018 was 2.5 and 5, respectively. The total number of options vesting attributed to general and administrative in the year ended December 31, 2019 and 2018 totaled 26,465 options and 42,819, respectively. That reduction in vested grants drove the decrease in stock compensation expense.

The reduction in intellectual property costs was driven by less required intellectual property filing and maintenance activity compared to prior years. The reduction in professional development costs was driven by fewer education and training requirements in the year ended December 31, 2019 compared to the year ended December 31, 2018.

Interest expense. Interest expense decreased by $610,600, or 96.45%, to $22,500 for the year ended December 31, 2019 from $633,100 for the year ended December 31, 2018. The decrease is driven by the variance in the balance of convertible promissory notes during the years ended December 31, 2019 and 2018. At December 20, 2018, there were outstanding convertible promissory notes totaling $6,725,000 which accrued interest at a rate of 7% and incurred $453,300 of interest expense. In addition, the convertible promissory notes embedded derivative liability increased interest expenses by approximately $167,000 during 2018 based on increases in the fair value of the liability prior to conversion.

The outstanding balance of convertible promissory notes converted into Series A-1 Preferred Stock on December 20, 2018. The remaining interest expense balance of $12,800 was driven by issuances of Series A-1 Preferred Stock. Between June 8, 2018 and August 17, 2018, we entered into agreements to issue preferred stock and received advances of $900,000. The advances received under the agreements were recorded as liabilities until the preferred stock was issued and bore interest at a rate of 6.5%. The agreements were amended on September 10, 2018, when, in exchange for additional preferred stock to be issued, the advances no longer bore interest. See "—Liquidity and Capital Resources" below.

During the year ended December 31, 2019, we issued and additional $250,000 convertible promissory notes, and we settled an account payable to a vendor for a convertible promissory note of $134,800. The issued notes accrued interest at a rate of 17% per annum, and the vendor settlement accrued interest at a rate of 6% per annum. Total interest expense accrued on the notes as of August 15, 2019 totaled $20,500. On August 15, 2019, each holder of convertible promissory notes issued during 2019 agreed to voluntarily convert the amounts of principal and interest then outstanding into shares of Series A-1 Preferred Stock. The remaining interest of $2,000 is attributable to increases to the fair value of the associated embedded derivable liability prior to conversion. See "—Liquidity and Capital Resources" below for more information.

Net loss. As a result of the cumulative effect of the factors described above, our net loss decreased to $3,727,900 for year ended December 31, 2019 from $3,815,700 for the prior year.

As of June 30, 2020, we had cash and cash equivalents of $1,683,500. As of December 31, 2019 and 2018, we had cash and cash equivalents of $1,929,100 and $384,300, respectively. We do not currently have any approved products and have never generated any revenue from product sales. To date, we have financed our operations primarily with proceeds from the sale of our convertible promissory notes and preferred stock.

Following our recent offering of Series B Preferred Stock discussed below and increased expenditures related to our ongoing research and development efforts as well as our pursuit of an initial public offering through the date of this filing, we determined that our current levels of cash will not be sufficient to meet our anticipated cash needs for our operations through August 24, 2021. We have incurred significant operating losses since inception, and we expect to incur significant expenses and operating losses for the foreseeable future as we advance the preclinical and clinical development of our product candidates. We expect that our research and development and general and administrative costs will increase, including in connection with conducting preclinical studies and clinical trials for our product candidates, contracting with CMOs and building out internal capacity to have product manufactured to support preclinical studies and clinical trials, expanding our intellectual property

portfolio and providing general and administrative support for our operations. As a result, substantial doubt exists regarding the going concern assumption on our financial statements.

We are seeking significant additional capital funding to develop our platform and Pre-IND product lines, additional hiring of scientific professionals and other general and administrative employees, and clinical trials. However, there can be no assurance that such efforts will be successful or that, in the event that they are successful, the terms and conditions of such financing will be favorable. Management has the ability to eliminate certain forecasted discretionary costs that would not be in violation of the intended use of proceeds outlined in the Series B Preferred Stock purchase agreements. In consideration of our plans, substantial doubt cannot be alleviated with respect to our continued operations through August 24, 2021. Management's plans, of which the raising additional capital is not within management's control and cannot be assured, do not alleviate such substantial doubt through August 24, 2021.

The following table sets forth a summary of our cash flows for the periods presented:

Net cash used in operating activities was $(2,603,800) for the six months ended June 30, 2020, as compared to $400,400 for six months ended June 30, 2019. In the six months ended June 30, 2020, net loss of $13,219,600 and outflows from prepaid expenses and other current assets in the amount of $141,500, offset by stock compensation expenses from common stock issuances in the amount of $9,432,000, stock compensation expenses from stock options of $899,000, and accounts payable in the amount of $291,200 were the key drivers for operating activities.

For the six months ended June 30, 2019, the net loss of $671,300, outflows from accounts payable totaling $98,200, and NIH grant receivables of $25,300 were offset by stock compensation expenses in the amount of $209,000, convertible notes derivative liabilities of $135,800, and prepaid expenses and other current assets in the amount of $11,400 were the primary drivers of the net cash used in operating activities.

Net cash used in operating activities increased by a total of $2,203,400 period-over-period. The main driver for the increase is the $12,548,300 increase in net loss offset by non-cash inflows from increased stock compensation expenses in the amount of $10,122,000. We primarily used cash to augment our research and development team, expand our leased property, expand our intellectual property portfolio, and pay for corporate development costs related to obtaining additional financing. See the "—Results of Operations" above for further details.

Net cash used in investing activities was $762,300 for the six months ended June 30, 2020, as compared to $20,000 for the six months ended June 30, 2019. Our net cash used in investing activities consisted entirely of purchases of property and equipment.

Net cash used in investing activities increased by a total of $742,300 in the six months ended June 30, 2020 from June 30, 2019. This was primarily driven by $702,200 in cash outflows attributed to construction in progress on our Good Manufacturing Practices and Vivarium facilities in our Houston Facility. Those assets have not been placed in service yet.

Net cash provided by financing activities was $3,120,500 during the six months ended June 30, 2020 as compared to $250,000 for the six months ended June 30, 2019. For the six months ended June 30, 2020, the net cash provided by financing activities primarily consisted of proceeds from preferred stock issuance in the amount of 3,000,000 and proceeds from a loan payable of $115,600. During the six months ended June 30, 2019, the net cash provided by financing activities consisted entirely of proceeds from the sale of convertible promissory notes in the amount of $250,000.

The following table sets forth a summary of our cash flows for the periods presented:

Net cash used in operating activities was $2,913,900 for the year ended December 31, 2019, as compared to $2,152,900 for year ended December 31, 2018. For the year ended December 31, 2019, the net loss of $3,727,900 and outflows from accrued expenses and other current liabilities in the amount of $151,300, offset by stock compensation expenses in the amount of $522,900, accounts payable of $293,400, depreciation expenses of $87,500, prepaid expenses and other current assets in the amount of $46,200, and NIH grant receivables of $24,300, were the primary drivers of the net cash used in operating activities. For the year ended December 31, 2018, the net loss of $3,815,700 and interest payable in the amount of $363,400, offset by stock compensation expenses in the amount of $633,000, non-cash interest of 633,100, prepaid expenses and other current assets in the amount of $212,500, convertible promissory notes derivative liability in the amount of $369,000, and accrued expenses and other current liabilities in the amount of $149,400, were the primary drivers of the net cash used in operating activities.

Net cash used in operating activities decreased by a total of $761,000 year-over-year. However, this variance was primarily driven by non-cash transactions. The main driver for the decrease is $612,600 decrease in non-cash interest. See the "—Results of Operations" above for further details. However, it is noted that management decided to finance operations primarily using preferred stock instead of interest bearing convertible promissory notes. Accordingly, fewer interest expense was incurred as a result. In addition, reductions to stock compensation expense resulted in a reduction of $110,100 of cash inflows. These reductions to cash inflows were offset by $6,600 of increased cash inflows from depreciation expense.

This remaining reduction in cash flows from operations was driven by reduced cash outflows from net loss and reduced cash inflows from changes in operating assets, offset by increased cash inflows from operating liabilities.

Cash outflows from net loss were reduced by $87,800. See the "—Results of Operations" above for further details.

Reduced cash inflows from changes in operating assets were driven by $166,300 from decreased prepaid and other current assets. Most of this impact is driven by a reclassification of prepaid expenses to accounts payable of $134,800. We ultimately settled that accounts payable with the vendor by converting the balance to a convertible note payable. In addition, there was reduced cash flow impact of $5,900 from inventories, and $3,600 from other non-current assets. These were offset by increased cash inflows of $43,200 from reimbursements under the NIH Grant.

Increased cash inflows from operating liabilities were impacted by $297,800 in accounts payable. This inflow is primarily driven by our management reaching terms with a vendor to delay payment totaling $176,900. In addition, there was increased cash inflow impact of $363,400 from interest payable. These were offset by decreased cash inflows from the convertible promissory notes derivative liability of $367,000. There were also offsetting increases in cash outflows of $300,700 from accrued expenses and other current liabilities.

Net cash used in investing activities was $302,700 for the year ended December 31, 2019, as compared to $137,300 for the year ended December 31, 2018. Our net cash used in investing activities consisted entirely of purchases of property and equipment.

Net cash provided by financing activities was $4,761,400 during the year ended December 31, 2019 as compared to $1,625,000 for the year ended December 31, 2018. For the year ended December 31, 2019, the net cash provided by financing activities consisted of proceeds from the sale of convertible promissory notes for $250,000, proceeds from preferred stock issuance in the amount of $4,500,000, and exercise of stock options to purchase common stock for $11,400. During the year ended December 31, 2018, the net cash provided by financing activities consisted of proceeds from the sale of convertible promissory notes in the amount of $725,000 and proceeds from preferred stock issuance in the amount of $900,000.

Starting in June 2016, we sold convertible promissory notes to certain investors to help finance our operations. The notes were in amounts ranging from $12,500 to $500,000, earning annual interest at 7% and all maturing on either June 1, 2019 or January 1, 2020. As of December 31, 2017, the combined carrying amount of the convertible promissory notes and the carrying amount of the related embedded derivative liability on the convertible promissory notes was $6,106,000. During the year ended December 31, 2018, an additional $725,000 convertible promissory notes were issued, earning annual interest at 7% and all maturing on June 1, 2019. The notes were convertible into shares issued in our next financing (as defined in the notes) by dividing the total amount of notes payable, plus accrued interest, by the applicable conversion price (defined generally as 80% of the lowest per share selling price in the next financing).

On December 20, 2018, following the issuance of shares of Series A-1 Preferred Stock described below, the outstanding principal and accrued interest was converted into shares of Series A-1 Preferred Stock. At the time of conversion, the outstanding principal and accrued interest of the notes totaled approximately $7,541,600. Accordingly, the notes were converted into an aggregate of 18,854,033 shares of Series A-1 Preferred Stock at a conversion price of $0.40 per share. No additional convertible promissory notes were outstanding as of December 31, 2018 following the conversion on December 20, 2018.

notes) by dividing the total amount of notes payable, plus accrued interest, by the applicable conversion price (defined generally as 85% of the lowest per share selling price in the next financing). Prior to the issuance of shares of Series B Preferred Stock (as discussed below), each holder agreed to voluntarily convert the amounts of principal and interest then outstanding into shares of Series A-1 Preferred Stock. Therefore, on August 15, 2019, these notes were converted into an aggregate of 632,123 shares of Series A-1 Preferred Stock at a conversion price of $0.43 per share.

In addition, during 2019, we settled an outstanding account payable with a vendor in the amount of $134,600 by issuing to that vendor a convertible promissory note for the amount owed. That convertible promissory note accrued interest at a rate of 6% and was to mature on June 30, 2020. This note was convertible into shares issued in our next financing (as defined in the note) by dividing the total amount of notes payable, plus accrued interest, by the applicable conversion price (defined generally as 90% of the lowest per share selling price in the next financing). Prior to the issuance of shares of Series B Preferred Stock (as discussed below), the holder agreed to voluntarily convert the amounts of principal and interest then outstanding into shares of Series A-1 Preferred Stock. Therefore, on August 15, 2019, this note was converted into 303,396 shares of Series A-1 Preferred Stock at a conversion price of $0.45 per share.

Between June 8, 2018 and August 14, 2018, we entered into agreements to issue preferred stock and received advances of $900,000. The advances received under the agreements were recorded as liabilities until the preferred stock was issued and bore interest at a rate of 6.5%. The agreements were amended on September 10, 2018, when, in exchange for additional preferred stock to be issued, the advances no longer bore interest. On December 20, 2018, 2,032,749 shares of Series A-1 Preferred Stock were issued for $912,800, representing the advances received and accrued interest through September 10, 2018. See "Description of Securities" for more information regarding our Series A-1 Preferred Stock.

On September 7, 2019, we entered into a Series B Preferred Stock purchase agreement with certain investors for the sale of shares of our Series B Preferred Stock at a price of $0.46 per share. On September 13, 2019, we sold an aggregate of 7,608,696 shares for total gross proceeds of approximately $3,500,000. On November 13, 2019, we sold an additional 2,173,913 shares for gross proceeds of $1,000,000. The shares of Series B Preferred Stock had accrued unpaid dividends at an annual rate of 6% per share. On December 6, 2019, the Series B Preferred Stock investors voted in favor of forfeiting all accrued and unpaid dividends, along with all future dividends. In exchange, we issued 87,050 shares of Series B Preferred Stock to the investors.

On January 24, 2020, we issued 4,782,608 shares of Series B Preferred Stock for $2,200,000. On January 29, 2020, we filed a certificate of correction to its amended and restated its certificate of incorporation to authorize the issuance of up to 16,500,000 shares of Series B Preferred Stock. On January 31, 2020, we issued an additional 1,739,130 shares of Series B Preferred Stock for $800,000.

We also issued each investor a warrant to purchase 0.0859 shares of common stock for each Series B Preferred share purchased, or warrants for an aggregate of 1,399,921 shares of common stock. The warrants have an exercise price of $0.003494 per share and expire ten years after the date of issuance. The warrants are exercisable as follows: (i) 30% of the shares underlying the warrants are exercisable from the date that is six months after the date on which our securities are first listed on a U.S. national securities exchange, (ii) an additional 30% of the shares underlying the warrants are exercisable nine months after such listing date, and (iii) the remaining shares underlying the warrants are exercisable twelve months after such listing date. On June 8, 2020, we agreed to amend the warrant vesting schedule outlined above, such that the warrants became immediately exercisable for each warrant

holder. On June 8, 2020, warrant holders exercised their option to purchase 335,982 shares of common stock for proceeds of $1,200. Then, on June 10, 2020, warrant holders exercised their option to purchase an additional 1,063,939 shares of common stock for proceeds of $3,700. See "Description of Securities" for more information regarding our Series B Preferred Stock and the warrants issued in this financing.

We did not have any off-balance sheet arrangements for any of the periods presented.

The preparation of financial statements in conformity with U.S. GAAP requires our management to make assumptions, estimates and judgments that affect the amounts reported, including the notes thereto, and related disclosures of commitments and contingencies, if any. We have identified certain accounting policies that are significant to the preparation of our financial statements. These accounting policies are important for an understanding of our financial condition and results of operation. Critical accounting policies are those that are most important to the portrayal of our financial condition and results of operations and require management's difficult, subjective, or complex judgment, often as a result of the need to make estimates about the effect of matters that are inherently uncertain and may change in subsequent periods. Certain accounting estimates are particularly sensitive because of their significance to financial statements and because of the possibility that future events affecting the estimate may differ significantly from management's current judgments. We believe the following critical accounting policies involve the most significant estimates and judgments used in the preparation of our financial statements:

Fair Value Measurements—The carrying value of our cash and cash equivalents, unbilled receivables from the granting agency, prepaid expenses and other assets, accounts payable, accrued expenses and other current liabilities approximate their fair value due to their short-term nature.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In estimating the fair value of an asset or a liability, we take into account the characteristics of the asset or liability if market participants would take those characteristics into account when pricing the asset or liability at the measurement date.

We account for financial instruments in accordance with ASC 820, Fair Value Measurements and Disclosures. ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 820 are described below:

There were no changes in the fair value hierarchy leveling during the years ended December 31, 2019 and 2018.

Stock-Based Compensation—We record stock compensation expense related to our 2017 Equity Incentive Plan in accordance with ASC 718, Compensation—Stock Compensation. We measure and recognize stock compensation expense for all stock-based awards, including stock options, based on estimated fair values recognized using the straight-line method over the requisite service period. The fair value of stock options is estimated on the grant date using the Black-Scholes option-valuation model. The calculation of stock-based compensation expense requires that we make assumptions and judgments about the variables used in the Black- Scholes option-valuation model, including the fair value of our common stock, expected term, expected volatility of the underlying common stock, and risk-free interest rate. Forfeitures are accounted for when they occur.

We estimate the grant-date fair value of stock options using the Black-Scholes option-valuation model and the assumptions used to value such stock options are determined as follows:

Expected Term. The expected term represents the period that our stock options are expected to be outstanding. Due to limitations on the sale or transfer of our common stock as a privately held company, we do not believe our historical exercise pattern is indicative of the pattern we will experience as a future publicly traded company. We have consequently used the SAB No. 110, simplified method to calculate the expected term, which is the average of the contractual term and vesting period. We plan to continue to use the SAB 110 simplified method until we have sufficient trading history as a publicly traded company.

Risk-Free Interest Rate. We base the risk-free interest rate used in the Black-Scholes option-valuation model on the implied yield available on US Treasury zero-coupon issues with a term equivalent to that of the expected term of the stock options for each stock option group.

Volatility. We determine the price volatility based on the historical volatilities of industry peers as we have no trading history for our common stock price. We intend to continue to consistently apply this process using the same or a similar peer group of public companies, until a sufficient amount of historical information regarding the volatility of our own common stock price becomes available, or unless circumstances change such that the identified peer companies are no longer similar, in which case other suitable peer companies whose common stock prices are publicly available would be utilized in the calculation.

Dividend Yield. The expected dividend assumption is based on our current expectations about our anticipated dividend policy. To date, we have not declared any dividends and, therefore, we used an expected dividend yield of zero.

Common Stock Valuations. The fair value of the common stock underlying our stock-based compensation grants has historically been determined by our board of directors, with input from management and third-party valuations. We believe that the board of directors has the relevant experience and expertise to determine the fair value of our common stock. Given the absence of a public trading market of our common stock, and in accordance with the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately- Held Company Equity Securities Issued as Compensation, the board of directors exercised reasonable judgment and considered numerous objective and subjective factors to determine the best estimate of the fair value of our common stock at each grant date. These factors include:

In valuing our common stock, the board of directors determined the equity value of our business using various valuation methods including combinations of income and market approaches. The income approach estimates value based on the expectation of future cash flows that a company will generate. These future cash flows are discounted to their present values using a discount rate derived from an analysis of the cost of capital of comparable publicly traded companies in our industry or similar business operations as of each valuation date and is adjusted to reflect the risks inherent in our cash flows. The market approach references actual transactions involving (i) the subject being valued, or (ii) similar assets and/or enterprises.

For each valuation, the equity value determined by the income and market approaches was then allocated to the common stock using either the option pricing method, or OPM, or probability—weighted expected return model, or PWERM.

The option pricing method is based on the Black Scholes option valuation model, which allows for the identification of a range of possible future outcomes, each with an associated probability. The OPM is appropriate to use when the range of possible future outcomes is difficult to predict and thus creates highly speculative forecasts. In general, while simple in its application, management did not use the OPM approach when considering allocation techniques for the valuation of equity interests in early stage, privately held life science companies. Management determined that applying the OPM would violate the major assumptions of the Black Scholes option valuation model approach. Additionally, the simulation approach can generally be reasonably approximated by a scenario-based approach like the PWERM as described below.

PWERM involves a forward-looking analysis of the possible future outcomes of the enterprise. This method is particularly useful when discrete future outcomes can be predicted at a relatively high confidence level with a probability distribution. Discrete future outcomes considered under the PWERM include an initial public offering, as well as non- initial public offering market-based outcomes. Determining the fair value of the enterprise using the PWERM requires us to develop assumptions and estimates for both the probability of an initial public offering liquidity event and stay private outcomes, as well as the values we expect those outcomes could yield. Since in February 2018, we have valued our common stock based on a PWERM.

Application of our approach involves the use of estimates, judgment, and assumptions that are highly complex and subjective, such as those regarding expected future revenue, expenses, and future cash flows, discount rates, market multiples, the selection of comparable companies, and the probability of possible future events. Changes in any or all of these estimates and assumptions or the relationships between those assumptions impact valuations as of each valuation date and may have a material impact on the valuation of our common stock.

For valuations after the completion of an initial public offering, the board of directors will determine the fair value of each share of underlying common stock based on the closing price of the common stock as reported on the date of grant. Future expense amounts for any particular period could be affected by changes in assumptions or market conditions.

Warrants Underlying Shares of Series B Preferred Stock—We record warrants to purchase shares of common stock underlying our shares of Series B Preferred Stock in accordance with ASC 470, Debt with conversion and other options. The fair value of the warrants is estimated on the purchase date using the Black-Scholes option- valuation model. The calculation of warrants requires that we make assumptions and judgments about the variables used in the Black-Scholes option-valuation model, including the fair value of our common stock, expected term, expected volatility of the underlying common stock, and risk-free interest rate.

We estimate the fair value of warrants using the Black-Scholes option-valuation model and the assumptions used to value such warrants are determined as follows:

Expected Term. The expected term represents the period that our warrants are expected to be outstanding. The warrants become exercisable in accordance with the schedule set forth below following completion by the Company of an initial public offering and thereafter may be exercised at any time prior to expiration ten years from the date of issuance.

Since the vesting schedule is contingent upon completion of an initial public offering, we assessed the expected term of the warrants to be ten years.

Common Stock Valuations. The fair value of the common stock underlying our warrants has historically been determined by our board of directors, with input from management and third-party valuations. We believe that the board of directors has the relevant experience and expertise to determine the fair value of our common stock. Given the absence of a public trading market of our common stock, and in accordance with the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately-Held Company Equity Securities Issued as Compensation, the board of directors exercised reasonable judgment and considered numerous objective and subjective factors to determine the best estimate of the fair value of our common stock at each grant date. These factors include:

The option pricing method is based on the Black-Scholes option valuation model, which allows for the identification of a range of possible future outcomes, each with an associated probability. The OPM is appropriate to use when the range of possible future outcomes is difficult to predict and thus creates highly speculative forecasts. In general, while simple in its application, management did not use the OPM approach when considering allocation techniques for the valuation of equity interests in early stage, privately held life science companies. Management determined that applying the OPM would violate the major assumptions of the Black Scholes option valuation model approach. Additionally, the simulation approach can generally be reasonably approximated by a scenario-based approach like the PWERM as described below.

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board, or FASB, or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on the Company's financial position, results of operations, or cash flows upon adoption.

In February 2016, the FASB issued Accounting Standards Update, or ASU, No. 2016-02, Leases (Topic 842), which requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. In July 2018, the FASB issued ASU 2018-11 to amend certain aspects of Topic 842. These amendments provide entities with an additional (and optional) transition method to adopt Topic 842. Under this transition method, an entity initially applies the transition requirements in Topic 842 at that Topic's effective date with the effects of initially applying Topic 842 recognized as a cumulative effect adjustment to the opening balance of retained earnings (or other components of equity or net assets, as appropriate) in the period of adoption. On June 3, 2020, the FASB changed the effective date of this standard to January 1, 2022. We are currently evaluating the potential impact of this standard on our financial position, results of operations, and cash flows.

In March 2016, FASB issued ASU 2016-09, Stock Compensation—Improvements to Employee Share-Based Payment Accounting. On January 1, 2018, we adopted the amendments to ASC 718, which simplify accounting for share based payment transactions. As part of the amendment, we have elected to recognize the actual forfeitures by reducing the employee share-based compensation expense in the same period as the forfeitures occur. The adoption did not result in a material impact on our financial statements and related disclosures.

In June 2016, FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326). The amendments in ASU 2016-13 affect entities holding financial assets and net investment in leases that are not accounted for at fair value through net income. The amendments affect loans, debt securities, trade receivables, net investments in leases, off-balance-sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The amendments in ASU 2016-13 require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. On October 16, 2019, the FASB changed the effective date of this standard to January 1, 2023. We are currently evaluating the potential impact of this standard on our financial position, results of operations, and cash flows.

On January 1, 2018, we adopted ASU 2018-07, Improvements to Non-employee Share-Based Payment Accounting (Topic 718). This standard expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees. FASB clarified that Topic 718 does not apply to share-based payments used to effectively provide financing to the issuer or awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under ASC 606, Revenue from Contracts with Customers. Since we have not generated any revenue to date, this adoption did not result in a material impact on our financial statements and related disclosures.

On January 1, 2019, we adopted ASU 2016-15 (Topic 230), Classification of Certain Cash Receipts and Payments, a new standard providing guidance on statement of cash flow classification on specific issues. The standard is effective for financial statements issued for fiscal periods beginning after December 15, 2018. It is required to be applied on a retrospective approach. We determined that this standard had no impact on its financial position, results of operations, and cash flows for the years ended December 31, 2019 and 2018, respectively.

We are a target discovery and gene-editing company utilizing artificial intelligence and our proprietary neural network platform with a therapeutic focus on immuno-oncology.

Kiromic's Diamond is big data science meeting target identification, dramatically compressing man-years and billions of drug development dollars to develop a live drug.

Diamond addresses the main challenges in today's clinical pipeline: target identification.

See our Diagram below which will walk readers through our process of going from antigens and target libraries to finish with target selection by our artificial intelligence engine.

Therefore, we believe that we have developed unique tools to address the issue with tumor-specific iso-antigens through CancerSplice and Diamond.

Target isoforms are protein variants of the same targets that occur during the normal processing of immature gene transcripts to the mature form.

If they are the predominate form on the cell surface, these isoforms can make it impossible for T cells to outright bind the targets on cancer cells.

No binding or insufficient binding to the isoform results in no killing of cancer cells.

Our CancerSplice accurately predicts the most appropriate isoforms for T cells to bind and destroy cancer cells.

CAR-T cell therapy, a form of cancer immunotherapy, has recently emerged as a revolutionary and potentially curative therapy for patients with hematologic cancers, including refractory cancers. In 2017, two autologous anti-CD19 CAR-T cell therapies, Kymriah, developed by Novartis International AG, and Yescarta, developed by Kite Pharma, Inc., (now part of Gilead), were approved by the FDA for the treatment of relapsing/remitting B cell precursor acute lymphoblastic leukemia and relapsing/remitting large B cell lymphoma, respectively. Autologous CAR-T cell therapies are manufactured individually for the patient's use by modifying the patient's own T cells outside the body, causing the T cells to express CARs. The entire manufacturing process is dependent on the viability of each patient's T cells and takes approximately three to four weeks. Allogenic T cell therapies involve engineering healthy donor T cells, which we believe will allow for the creation of an inventory of off-the-shelf products that can be delivered to a larger portion of eligible patients throughout the world.

CARs are engineered molecules that, when present on the surface of a T cell, enable the T cell to recognize specific proteins or antigens that are present on the surface of other cells.

where allogenic T cells can recognize the patient's normal tissue as foreign and cause damage in the patient.

ABBIE is a novel gene-editing system for inserting therapeutic genes safely into the genome of a host cell.

The OFF switch permits fast shutdown in the event of an unexpected toxicity. Additional Anti-tumor factors can help neutralize the toxic tumor microenvironment.

ACTIVATION Switch. A rapidly deployed activation switch can provide a survival and proliferation signal to the therapeutic cells to enhance their efficacy and persistence in vivo.

The three primary steps to creating our engineered effector cells are: (1) collection, (2) gene editing, and (3) purification, formulation, and storage.

chPD1-expressing T cells can efficiently lyse both hematologic and solid tumors expressing PD-L1 and/or PD-L2, leading to greatly improved survival with minimal toxicity in animal models.

chPD1 Receptor signaling also leads to cytokine release that can have widespread anti-tumor effects in the tumor microenvironment.

These cells are stimulated to proliferate, then transduced with a non-replicating retroviral vector to introduce the CAR gene into the patient's T/NK cells.

These engineered cells are then propagated in cell culture bags until sufficient cells are available. The engineered T/NK cells are then washed and frozen at the cell processing site.

Note that we have not yet completed our ABBIE (gene editing) technology as shown in Step No. 5 above. Our clinical trial will be using the current industry standard retroviral vector.