8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): June 14, 2024

MOLECULIN BIOTECH, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware	001-37758	47-4671997
(State or Other Jurisdiction of Incorporation or Organization)	(Commission File No.)	(I.R.S. Employer Identification No.)

5300 Memorial Drive, Suite 950, Houston, TX 77007

(Address of principal executive offices and zip code)

(713) 300-5160

(Registrant’s telephone number, including area code)

(Former name or former address, if changed from last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-14(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).          Emerging growth company ☐

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 pursuant to Section 13(a) of the Exchange Act. ☐

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol (s)	Name of each exchange on which registered
Common Stock, par value $.001 per share	MBRX	The NASDAQ Stock Market LLC

Item 7.01 Regulation FD Disclosure

On June 14, 2024, Moleculin Biotech, Inc. (the “Company”), issued a press release which announced additional efficacy findings from the Company’s ongoing Phase 1B/2 (MB-106) clinical trial evaluating Annamycin in combination with Cytarabine (also known as “Ara-C” and for which the combination of Annamycin and Ara-C is referred to as AnnAraC) for the treatment of subjects with acute myeloid leukemia (AML). The preliminary data was presented at the European Hematology Association (EHA) 2024 Hybrid Congress. The Company also hosted a data presentation to leading AML experts as part of a KOL meeting held in conjunction with EHA 2024 Congress.

A copy of the press release is attached to this report as Exhibit 99.1 and is incorporated by reference herein.

The information contained in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be “filed” for the purpose of the Securities Exchange Act of 1934, as amended (“Exchange Act”), nor shall it be incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), unless specifically identified therein as being incorporated by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. Description

99.1	Press Release dated June 14, 2024
99.2	EHA Poster dated June 2024

104 Cover page Interactive Data File (formatted as Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

MOLECULIN BIOTECH, INC.
Date:	June 14, 2024
By:	/s/ Jonathan P. Foster
	Jonathan P. Foster

EX-99.1

Exhibit 99.1

Moleculin Announces Additional Positive Preliminary Interim Data from AML Clinical Trial

– 89% of CRc’s were subjects with “poor prognosis” cytogenetics and/or mutations

– Current median durability of response (mDOR) of CRc’s = 6 months and increasing (n=9)

– In 2^nd line subjects (n=10) Annamycin in combination with Cytarabine (AnnAraC) achieved an estimated median overall survival (mOS) of 6 months and increasing plus 5 CR’s (50%) and 6 CRc’s (60%)

– Recruitment increased to 22 subjects and CRc’s in all subjects evaluable for efficacy (n=20) was 45%

– Annamycin continues to demonstrate no cardiotoxicity

– Data presented at European Hematology Association (EHA) 2024 Hybrid Congress and Company KOL Meeting in Madrid

HOUSTON, June 14, 2024 /PRNewswire/ -- Moleculin Biotech, Inc., (Nasdaq: MBRX) (“Moleculin” or the “Company”), a clinical stage pharmaceutical company with a broad portfolio of drug candidates targeting hard-to-treat tumors and viruses, today reported additional efficacy findings from the Company’s ongoing Phase 1B/2 (MB-106) clinical trial evaluating Annamycin in combination with Cytarabine (also known as “Ara-C” and for which the combination of Annamycin and Ara-C is referred to as AnnAraC) for the treatment of subjects with acute myeloid leukemia (AML). The preliminary data was presented at the European Hematology Association (EHA) 2024 Hybrid Congress. The Company also hosted a data presentation to leading AML experts as part of a KOL meeting held in conjunction with EHA 2024 Congress.

To date, a total of 22 subjects have been enrolled (the Intent-to-Treat population, ITT), 20 (Lines 1^st-7^th) of whom have completed efficacy evaluations with 9 subjects (45%) achieving a composite complete remission (CRc or CR/CRi), consisting of 8 (40%) subjects with complete remission (CR) and one subject with complete remission with an incomplete recovery of peripheral blood counts (CRi), following treatment with AnnAraC. Efficacy outcomes for 2 additional subjects (enrolled and treated) are pending.

Of the 10 ITT subjects for whom AnnAraC was administered in the 2^nd line setting, 5 achieved a CR (50%) and 6 achieved a CRc (60%). Of the 13 subjects in the ITT evaluable population that were 1^st or 2^nd line treatment, 7 achieved a CR (54%) and 8 achieved a CRc (62%). The mDOR for the 9 subjects who achieved a CRc is approximately 6 months and climbing. Additionally, the median overall survival in the 2^nd line subjects (n=10) is approximately 6 months and increasing.

Additionally, 89% of the subjects included in the CRc group (n=9) had cytogenetics and/or mutations generally considered to contribute to a poor prognosis. These include FLT3, IDH2, ASXL1, KMT2A and others. While not yet statistically relevant, the Company believes such cytogenetic and mutation data are informative to clinicians.

“We continue to be highly encouraged by the positive growing body of preliminary clinical data demonstrated by Annamycin in the treatment of patients with AML,” commented Walter Klemp, Chairman and Chief Executive Officer of Moleculin. “While still preliminary, we believe the efficacy to date including the climbing durability of response demonstrated by AnnAraC in 2^nd line patients continues to significantly exceed the performance reported by any drug currently approved for use in 2^nd line AML. We are incredibly pleased with the progress of the trial and the data and continue to advance our preparations for an End of Phase 2 meeting with FDA.”

“There remains a significant unmet need for safe and effective therapies for R/R AML. These data are exciting, and I believe further underscore the potential of Annamycin to provide patients and physicians with a promising treatment option in AML,” concluded Mr. Klemp.

Certain slides from the KOL meeting described above are shared below.

Preliminary Results Across All Lines of Treatment:

Median Durability of Response:

Response by Genotype and Mutations:

Currently, the median age of subjects in MB-106 is 69 years. Not including the two most recent subjects, a total of 17 subjects had relapsed/refractory AML and 3 subjects were first line treatment. Two subjects discontinued early due to allergic reactions. All subjects who completed treatment had undergone post-therapy bone marrow assessment (Day 15 or later). No clinically significant signs of cardiotoxicity were noted during or after treatment in any of the subjects enrolled. The combination was well tolerated with myelosuppression and infections being the main adverse events (AEs). All data from MB-106 is preliminary and subject to change.

Data presented at the European Hematology Association (EHA) 2024 Hybrid Congress:

As previously announced, the poster titled “LIPOSOMAL ANNAMYCIN (L-ANN) IN COMBINATION WITH CYTARABINE FOR TREATMENT OF PATIENTS WITH ACUTE MYELOID LEUKAEMIA (AML) REFRACTORY TO OR RELAPSED (R/R) AFTER INDUCTION THERAPY (MB-106 STUDY),” was presented as part of the “Acute myeloid leukemia – Clinical” session by Wolfram C. M. Dempke, MD, PhD, MBA, European Chief Medical Officer of Moleculin. The poster presentation mentioned above will be posted on the Company’s website and filed on Form 8-K with the Securities and Exchange Commission.

Annamycin currently has Fast Track Status and Orphan Drug Designation from the U.S. Food and Drug Administration for the treatment of relapsed or refractory acute myeloid leukemia, in addition to Orphan Drug Designation for the treatment of soft tissue sarcoma. Furthermore, Annamycin has Orphan Drug Designation for the treatment of relapsed or refractory acute myeloid leukemia from the European Medicines Agency (EMA). For more information about the ongoing MB-106 Phase 1B/2 trial, visit clinicaltrialsregister.eu and reference EudraCT 2020-005493-10 or clinicaltrials.gov and reference NCT05319587.

About Moleculin Biotech, Inc.

Moleculin Biotech, Inc. is a clinical stage pharmaceutical company with a growing pipeline, including Phase 2 clinical programs, for hard-to-treat tumors and viruses. The Company’s lead program, Annamycin is a next-generation anthracycline designed to avoid multidrug resistance mechanisms and to eliminate the cardiotoxicity common with currently prescribed anthracyclines. Annamycin is currently in development for the treatment of acute myeloid leukemia (AML) and soft tissue sarcoma (STS) lung metastases. All interim and preliminary data related to its active clinical trials are subject to change.

Additionally, the Company is developing WP1066, an Immune/Transcription Modulator capable of inhibiting p-STAT3 and other oncogenic transcription factors while also stimulating a natural immune response, targeting brain tumors, pancreatic and other cancers. Moleculin is also engaged in the development of a portfolio of antimetabolites, including WP1122 for the potential treatment of viruses, as well as certain cancer indications.

For more information about the Company, please visit www.moleculin.com and connect on Twitter, LinkedIn and Facebook.

Forward-Looking Statements

Some of the statements in this release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995, which involve risks and uncertainties. Although Moleculin believes that the expectations reflected in such forward-looking statements are reasonable as of the date made, expectations may prove to have been materially different from the results expressed or implied by such forward-looking statements. Moleculin has attempted to identify forward-looking statements by terminology including ‘believes,’ ‘estimates,’ ‘anticipates,’ ‘expects,’ ‘plans,’ ‘projects,’ ‘intends,’ ‘potential,’ ‘may,’ ‘could,’ ‘might,’ ‘will,’ ‘should,’ ‘approximately’ or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. These statements are only predictions and involve known and unknown risks, uncertainties, and other factors, including those discussed under Item 1A. “Risk Factors” in our most recently filed Form 10-K filed with the Securities and Exchange Commission (SEC) and updated from time to time in our Form 10-Q filings and in our other public filings with the SEC. Any forward-looking statements contained in this release speak only as of its date. We undertake no obligation to update any forward-looking statements contained in this release to reflect events or circumstances occurring after its date or to reflect the occurrence of unanticipated events.

Investor Contact:

JTC Team, LLC

Jenene Thomas

(833) 475-8247

MBRX@jtcir.com

EX-99.2

Exhibit 99.2

XML

Document And Entity Information	Jun. 14, 2024
Document Information [Line Items]
Entity, Registrant Name	MOLECULIN BIOTECH, INC.
Document, Type	8-K
Document, Period End Date	Jun. 14, 2024
Entity, Incorporation, State or Country Code	DE
Entity, File Number	001-37758
Entity, Tax Identification Number	47-4671997
Entity, Address, Address Line One	5300 Memorial Drive, Suite 950
Entity, Address, City or Town	Houston
Entity, Address, State or Province	TX
Entity, Address, Postal Zip Code	77007
City Area Code	713
Local Phone Number	300-5160
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Entity, Emerging Growth Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	MBRX
Security Exchange Name	NASDAQ
Amendment Flag	false
Entity, Central Index Key	0001659617