June 2020 JP Morgan Healthcare Conference January 10, 2022 Exhibit 99.1
Forward-Looking Statements This presentation contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on our current beliefs, expectations and assumptions regarding the future of our business, future plans and strategies, our clinical results and other future conditions. All statements other than statements of historical facts contained in this presentation are forward-looking statements, including statements by Atea Pharmaceuticals, Inc. (the “Company”) regarding future results of operations and financial position, including our anticipated cash runway; business strategy; current and prospective product candidates; anticipated milestone events; potential benefits of our product candidates and market opportunity; planned clinical trials, including, without limitation, anticipated initiation, enrollment, regulatory submission and data readout timelines; preclinical activities; product approvals; manufacturing availability; degree of market acceptance of approved products; research and development costs; current and prospective collaborations; and prospects and opportunities for investors. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “targets,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar expressions. The information in this presentation, including without limitation the forward-looking statements contained herein, represent our views as of the date of this presentation. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any anticipated results, performance or achievements expressed or implied by the forward-looking statements. Risks and uncertainties that may cause actual results to differ materially include uncertainties inherent in the drug development process and the regulatory approval process, in particular for bemnifosbuvir (AT-527), ruzasvir and AT-752, our reliance on third parties over which we may not always have full control, competition from treatments for COVID-19 and hepatitis C and vaccines for COVID-19 and dengue, risks related to the COVID-19 pandemic on our business, and other important risks and uncertainties that are described in our most recent Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (“SEC”) and our other filings with the SEC. New risk factors and uncertainties may emerge from time to time, and it is not possible to predict all risk factors and uncertainties. Accordingly, you are cautioned not to place undue reliance on these forward-looking statements. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise. No representations or warranties (expressed or implied) are made about the accuracy of any such forward-looking statements. Industry Information Market data and industry information used throughout this presentation are based on management’s knowledge of the industry and the good faith estimates of management. We also relied, to the extent available, upon management’s review of independent industry surveys and publications and other publicly available information prepared by a number of third-party sources. All of the market data and industry information used in this presentation involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. Although we believe that these sources are reliable, we cannot guarantee the accuracy or completeness of this information, and we have not independently verified this information. While we believe the estimated market position, market opportunity and market size information included in this presentation are generally reliable, such information, which is derived in part from management’s estimates and beliefs, is inherently uncertain and imprecise. No representations or warranties are made by the Company or any of its affiliates as to the accuracy of any such statements or projections. Projections, assumptions and estimates of our future performance and the future performance of the industry in which we operate are necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those described above. These and other factors could cause results to differ materially from those expressed in our estimates and beliefs and in the estimates prepared by independent parties. DISCLAIMERS
ssRNA VIRUS THERAPEUTIC INDICATION PRECLINICAL PHASE 1 PHASE 2 PHASE 3 Coronaviridae COVID-19 Bemnifosbuvir (AT-527) Nucleotide* COVID-19 Combination with protease inhibitors Bemnifosbuvir Nucleotide Flaviviridae Hepatitis C (HCV) Bemnifosbuvir Nucleotide Hepatitis C (HCV) Dengue Virus Ruzasvir** (NS5A inhibitor) AT-752 Nucleotide Paramyxoviridae Respiratory Syncytial Virus (RSV) Product Candidates Proprietary Platform Generates Deep Antiviral Pipeline Bemnifosbuvir (AT-527): preferred backbone for first combination with protease inhibitors for COVID-19 HCV and dengue programs advancing in several Phase 2 trials in 2022 Multiple value-driving milestones over next 18-months across several indications $839.7 million in cash and cash equivalents as of 9/30/21 Cash runway through 2025 HIGHLIGHTS Bemnifosbuvir is the generic name for AT-527 *Bemnifosbuvir is a double prodrug nucleotide analog ** Worldwide exclusive license for all uses from Merck
Comprehensive Approach to COVID-19 Bemnifosbuvir
Vision for Bemnifosbuvir in COVID-19: Backbone of First Combination Therapy Bemnifosbuvir (AT-527) Addresses Key Challenges of COVID-19 Oral nucleotide with antiviral activity across SARS-CoV-2 variants of concern/interest Targets viral RNA polymerase, highly conserved enzyme critical to viral replication Unique mechanism with dual targets creating high barrier to resistance: NiRAN inhibition Chain termination (RdRp) w/o introducing mutations in viral genome Non-mutagenic in mammalian cells in nonclinical studies and no effect on reproduction and non-teratogenic Rapid & sustained antiviral activity demonstrated in Ph 2 in high-risk patients bemnifosbuvir NiRAN RdRp Nsp12 Functional Domains SARS-Cov-2 N - 51 932 - C 366 249 RdRp = RNA-dependent RNA polymerase NiRAN = Nidovirus RdRp-Associated Nucleotidyltransferase COVID-19 Nucleos(t)ide class: Established therapeutics as the backbone of oral combination treatments for many RNA viral diseases
COVID-19 Persistent Viral Disease - Transitioning to Endemic with Pandemic Surges 6 COVID-19 Over 6,000 variants sequenced New variants associated with increased transmissibility, neutralization resistance and disease severity Omicron variant > 30 mutations to viral spike protein Extremely contagious and spreading faster than previously detected strains 5th worldwide wave As with previous RNA viruses, there will be an ongoing need for combinations of new oral therapies targeting different MOAs Monotherapies, including protease inhibitors, have limitations against RNA viruses due to emergence of drug resistance Lupala et al 2022 BBRC 590:34-41
7 AT-511 (free base of bemnifosbuvir) Active In Vitro Against all SARS-CoV-2 Variants Variant Lineage Strain Relative Potency* AT-511 EC90 [Variants/USA-WA-1] Original A USA-WA1/2020 1 Alpha B.1.1.7 England/ 204820464/2020 2.8 (n=3) Gamma P.1 Japan/TY7-503/2021 3.2 (n=3) Epsilon B.1.427 USA/CA/ VRLC009/2021 1.0 (n=2) Delta B.1.617.2 USA/PHC658/2021 1.2 (n=3) Omicron B.1.1.529 USA/MD-HP20874/2021** In process AT-511 EC90 = 0.64 ± 0.36 µM (n=14) (0.15-1.55 µM) against USA-WA-1 in Viral Yield Assay in primary HAE cells *Determined side-by-side in the same assay EC90 differences between variants were within in vitro assay variations **No new mutation in RNA polymerase of Omicron as compared with other variants COVID-19
8 In vitro combination studies with protease inhibitors are being initiated to explore antiviral synergy and address potential emergence of resistance Bemnifosbuvir – Nucleos(t)ide Polymerase of Choice for Potential Combination Therapy with Protease Inhibitor for COVID-19 Bemnifosbuvir Molnupiravir Remdesivir Route of administration Oral Oral IV Mutagenic potential No Yes No Variant coverage Yes Yes Yes Resistance barrier High Risk to enhance viral evolution High Viral load reduction in high-risk patients Yes (0.5-0.7 log10) Yes (0.2-0.5 log10) No Effect Reported COVID-19
9 Clinical Development Update and Plan Bemnifosbuvir
Bemnifosbuvir Safety and Antiviral Activity Summary Clinical Development Highlights Accomplished To-Date Phase 1 studies demonstrated trough levels exceeding EC90 in >75% of patients Bronchoalveolar lavage study confirmed drug levels approximating plasma levels achieved in airways Rapid and sustained antiviral activity demonstrated in two Phase 2 studies in high-risk patients No dose adjustment necessary for co-administration with drugs that are CYP3A substrates Generally safe and well tolerated 10 COVID-19 2022: Continue to enrich Phase 2 data set to support combination studies
Bemnifosbuvir Clinical Development Program for COVID-19 11 TRIAL DESCRIPTION STATUS Phase 1 Healthy Volunteers PK, tolerability with optimized formulation at doses up to 1100 mg BID Ongoing Phase 2 Monotherapy - Hospitalized High Risk Patients with Moderate COVID-19 Safety, tolerability, and virology Proof of Concept in high-risk Closing out Phase 2 Monotherapy - Outpatient (MOONSONG) Low and High-Risk Patients with Mild/Moderate COVID-19 Antiviral activity of AT-527 compared with placebo in outpatients Safety, PK, PK/PD Proof of Concept in high-risk Closed out Phase 2 Monotherapy - Outpatient High Risk Patients with COVID-19 Safety, tolerability and virology Initiate 2022 Data expected late 2022 Combination Trial - Outpatient Bemnifosbuvir in combination with protease inhibitor Initiate late 2022 COVID-19
Bemnifosbuvir Global Phase 2 Hospitalized Study Interim Results for COVID-19: Rapid and Sustained Decrease in Viral Load in All Evaluable Patients (High Risk, Unvaccinated) 12 Bemnifosbuvir 500 mg BID Day 2 -0.7 log10 reduction vs. placebo Viral Load Decrease from Baseline Bemnifosbuvir Placebo COVID-19
13 Bemnifosbuvir Phase 2 MOONSONG Exploratory Analyses Infectious Virus: High-Risk Patients Potent and Rapid Antiviral Activity Suggesting Dose Response between Cohort A and B Infectious Virus Titer Change from Baseline* Cohort A (550 mg BID ) High Risk Subgroup** *Baseline adjusted (ANCOVA) considering differences in baseline virus titer between active/placebo. **Exploratory subgroup analysis. COVID-19 Potent viral load reduction in high-risk patients at Day 3 Bemnifosbuvir Cohort A (550 mg BID): -0.3 log10 vs. placebo Bemnifosbuvir Cohort B (1,100 mg BID): -0.9 log10 vs. placebo Bemnifosbuvir Placebo Infectious Virus Titer Change from Baseline* Cohort B (1,100 mg BID ) High Risk Subgroup**
Vision for Bemnifosbuvir in COVID-19: Nucleotide of Choice First Combination Therapy Planned Phase 2 outpatient trial builds upon positive findings in high-risk patients in previous Phase 2 trials Up to 200 high-risk outpatients with mild-moderate COVID-19 Utilizing a formulation with rapid dissolution and absorption Enriching data set for high-risk outpatients and in parallel preparing for initiation of a combination trial Data expected late 2022 Combination trials may consist of two investigational agents with demonstrated safety and antiviral activity or a combination of an investigational agent with an approved drug COVID-19
Hepatitis C: Global Strategy
16 HCV-related mortality incidence has increased even with effective DAA combinations Approx. 70% of long-term IV drug users have HCV in US Convenient 8 weeks or shorter treatments are needed for new wave of early/acute HCV infection Best-in-class combination has potential for > $1B Fueled by the Opioid Crisis, US Hepatitis C Infections Continue to Increase 2020 Global HCV Market $4.1 Billion*; US ~50% of Global DAA Sales in 2020 *Source: Gilead 2020 Investor Report, AbbVie 2020 Investor Report, Merck 2020 Investor Report HEPATITIS C
17 Exclusive worldwide license from Merck License includes all human indications Next generation pan-genotypic potent antiviral activity in picomolar range in in vitro studies confirmed with > 3 log10 viral load decline in HCV-infected patients as monotherapy Demonstrated substantial synergy with bemnifosbuvir in vitro >1,250 HCV-infected patients administered Ruzasvir in combination at daily doses up to 180 mg for up to 24 wks RZR demonstrated favorable safety profile Low potential for drug-drug interactions PK profile supports once-daily dosing RUZASVIR (RZR) – Oral, Highly Potent Pan-genotypic NS5A Inhibitor for HCV Patients Favorable Safety and Drug-Drug Interaction Profile, Ideal for Combination with Bemnifosbuvir In vitro Synergy: Assay performed in HCV GT1b replicon (Huh-luc/neo-ET) Analyzed in MacSynergy (ImQuest) AT-511 is the free base of bemnifosbuvir HEPATITIS C
18 4.5 log10 ± 0.3 IU/ml in GT3-infected patients 4.6 log10 ± 0.5 IU/ml in patients with compensated cirrhosis (GT1,2,3) Bemnifosbuvir as Monotherapy Demonstrated Unprecedented Antiviral Activity with Favorable Safety Profile in Phase 1 and Phase 2 Clinical Trials Last Dose Bemnifosbuvir 550 mg QD Dose GT1b vs. GT3 vs. Cirrhotic NC=Non-cirrhotic Bemnifosbuvir ~10-fold more active than sofosbuvir (SOF) in vitro vs panel of laboratory strains and clinical isolates of HCV genotypes 1–5 Remained fully active against SOF resistance-associated strains (S282T) Favorable in vivo preclinical safety profile PK profile allows once-daily dosing >480 subjects (including healthy volunteers & HCV or COVID-19 patients) administered bemnifosbuvir in 10 clinical trials with favorable safety and tolerability HCV patients exposed to 550 mg dose of bemnifosbuvir for durations of 8-12 weeks with no-drug related SAEs HEPATITIS C
19 Bemnifosbuvir + Ruzasvir: Phase 2 combination-ready assets Phase 2 combination program expected to initiate 2H 2022 to evaluate: Convenient and short 8-week duration (potentially shorter for early/acute infections) Acute and chronic HCV infection Patients with compensated and decompensated liver disease Bemnifosbuvir is the most potent nucleotide inhibitor to-date being developed for HCV Ruzasvir is a highly potent Phase 2-ready drug candidate Potential for best-in-class pan-genotypic fixed-dose combination HCV Development Plan for Bemnifosbuvir + Ruzasvir Potential Best-in-Class Pan-genotypic Regimen HEPATITIS C Bemnifosbuvir + Ruzasvir Competitive Profile Convenient and Short duration Potential for first RBV-free therapy for decompensated disease
20 Clinical Proof-of-Concept Program for Dengue Fever AT-752
Painful, debilitating mosquito-born disease Caused by 4 serotypes Symptoms 3-14 days post-infection with high fever 2-7 days Dengue Fever: High Mortality and High Unmet Medical Need 21 People live in high-risk areas* strong efficacy in an dengue range currently expanding Estimated infected annually Severe dengue mortality rate if left untreated Cases develop into dengue hemorrhagic fever annually, requiring hospitalization (approx. 2.5% mortality rate) AT-752: Promising product profile Purine nucleotide prodrug with potent in vitro activity against all serotypes tested MOA: inhibition of dengue viral polymerase Potent in vivo antiviral activity in a dengue virus animal model Successful development and FDA approval of AT-752 may result in US priority review voucher *More than 100 countries in Southeast Asia, Western Pacific, Eastern Mediterranean, Latin America and Puerto Rico; 2.3M in the Americas alone, causing ≥ 1, 200 deaths No antiviral treatments available Only supportive care (analgesics, judicious fluid therapy) Dengvaxia® (for prevention) was approved in 2017 June 2021 ACIP Dengvaxia® vaccine recommendation for persons 9-16 years with previous infection living in endemic areas, including Puerto Rico ~4B ~400M 12-44% 500,000 DENGUE
Successful Completion of AT-752 Phase 1 Study 1 SAD and 3 MAD Cohorts 22 Objectives: Safety and PK (with embedded food effect) Part 1: Single ascending dose cohort Part 2: Multiple dose QD/BID/TID Inclusion Criteria: healthy volunteers, sequential dose-escalation Country: Australia AT-752 Dose MAD Randomization Placebo Double-blind oral administration: up to 7 days 4Q / 21 Completed AT-752 Dose SAD AT-752 was well tolerated after either single or multiple doses in healthy subjects Favorable safety profile with no changes in relevant laboratory parameters No premature discontinuations due to adverse events or serious adverse events Most adverse events mild N=64 DENGUE
AT-752 Phase 1 Pharmacokinetic Results Demonstrate Effective Drug Exposure for Inhibiting Dengue Virus Replication 23 Target EC90 750 mg TID Rapidly Achieved Plasma Levels of Surrogate Metabolite Above in vitro EC90 DENGUE
24 Population: Healthy subjects, 18-55 years Location: US Design: Day 1: 12 subjects randomized 3:1 administered oral AT-752 or matching placebo Day 2: Challenged with 0.5 mL DENV-1-LVHC (6.5 x 103 PFU/mL) AT-752 Human Challenge Infection Model DENGUE Endpoints: Mean quantitative viral load (peak, duration and AUC) by qRT-PCR until 28 days post virus inoculation Time to positive viral load by qRT-PCR Initiation 1H 2022 Results expected 2H 2022
AT-752 Phase 2 Global Proof-of-Concept Treatment Study Design 25 AT-752 Dose B Randomization N=Up to 60 Placebo Double-blind oral administration: 5 days 1H / 22 Initiation AT-752 Dose A AT-752 Dose C Objectives: Antiviral activity, safety, PK Primary endpoint: Change in dengue virus viral load from baseline Inclusion Criteria: adults with fever (≥38°C) within 48 hour of probable dengue infection and positive result on NS1 antigen test or RT-PCR assay Location: Asia, South America Randomized, double-blind, placebo-controlled trial in adult patients with dengue fever Objectives: antiviral activity, safety, and PK Primary endpoint: Change in dengue virus viral load from baseline Exploratory: viremia, NS1 levels, fever Population: adults with fever (≥38°C) within 48 h with probable dengue infection and positive result on NS1 antigen test or RT-PCR assay Initiation 1H 22 with initial results expected 2H 2022 DENGUE
Closing Remarks 26
Multiple Upcoming Value-Driving Milestones Phase 2 data: late 2022 Initiate Phase 2/3 combo trial + protease inhibitor: late 2022 Initiate bemnifosbuvir + Ruzasvir Phase 2 combo trial: late 2022 Initiate proof-of-concept program: initial data late 2022 Cash runway through 2025 COVID-19 Hepatitis C Dengue ssRNA VIRUS THERAPEUTIC INDICATION PRECLINICAL PHASE 1 PHASE 2 PHASE 3 Coronaviridae COVID-19 Bemnifosbuvir (AT-527) Nucleotide* COVID-19 Combination with protease inhibitors Bemnifosbuvir Nucleotide Flaviviridae Hepatitis C (HCV) Bemnifosbuvir Nucleotide Hepatitis C (HCV) Dengue Virus Ruzasvir** (NS5A inhibitor) AT-752 Nucleotide Paramyxoviridae Respiratory Syncytial Virus (RSV) Product Candidates Bemnifosbuvir is the generic name for AT-527 *Bemnifosbuvir is a double prodrug nucleotide analog ** Worldwide exclusive license for all uses from Merck 2022 EXPECTED MILESTONES
June 2020 125 Summer Street Boston MA USA 02110 857 284 8891 www.ateapharma.com