Moleculin Biotech to Participate in Advances in Oncology Panel at the 2026 Maxim Growth Summit

Moleculin Biotech, Inc. (Nasdaq: MBRX) (“Moleculin” or the “Company”) today announced that it will present at the upcoming 2026 Maxim Growth Summit in New York, NY. Details of the presentation are as follows:

Session: Advances in Oncology Panel Presenter: Walter Klemp, Chairman and Chief Executive Officer of Moleculin Date/time: Wednesday, October 14, 2026, from 9:00 - 10:00 a.m. ET Location: NYY Room at the Hard Rock Hotel NYC

Mr. Klemp will discuss Moleculin’s oncology pipeline and recent clinical progress, including the Company’s lead investigational candidate, Annamycin, and its ongoing Phase 2/3 MIRACLE clinical trial evaluating Annamycin in combination with cytarabine (AnnAraC) for the treatment of adults with relapsed or refractory acute myeloid leukemia (R/R AML). Moleculin recently announced that Part A enrollment is completed in the MIRACLE trial, and the Company remains on track for its planned comprehensive data readout of Part A in the first quarter of 2027.

In addition to the Company’s presentation, management will be available for meetings with institutional investors in one-on-one sessions.

This prestigious event brings together industry leaders, innovators, and premier institutions to explore the latest trends and advancements across several industries. For more information and a complete agenda of the Maxim Growth Summit, please visit www.maximgrp.com/2026-growth-summit

About Moleculin Biotech, Inc.

Moleculin Biotech, Inc. is a Phase 3 clinical stage pharmaceutical company advancing a pipeline of therapeutic candidates addressing hard-to-treat tumors and viruses. The Company’s lead program, Annamycin (also known as naxtarubicin), has shown to be an efficacious and well tolerated anthracycline designed to avoid multidrug resistance mechanisms and to lack the cardiotoxicity common with currently prescribed anthracyclines. Annamycin is currently in development for the treatment of relapsed or refractory acute myeloid leukemia (AML) and soft tissue sarcoma (STS) lung metastases.

The Company is conducting the MIRACLE ( M olecul i n R /R AML A nnAraC Cl inical E valuation) Trial (MB-108), a pivotal, adaptive design, multi-center, randomized, double-blind, placebo-controlled Phase 2/3 trial evaluating Annamycin in combination with cytarabine (also referred to as “Ara-C”), together referred to as AnnAraC, for the treatment of relapsed or refractory acute myeloid leukemia. Following a successful Phase 1B/2 study (MB-106), with input from the FDA, the Company believes it has substantially de-risked the development pathway toward a potential approval for Annamycin for the treatment of AML. This study remains subject to appropriate future filings with potential additional feedback from the FDA and their foreign equivalents.

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 also has in its pipeline a portfolio of antimetabolites, including WP1122 for the potential treatment of pathogenic viruses, as well as certain cancer indications.

For more information about the Company, please visit www.moleculin.com and connect on X , 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. Forward-looking statements in this press release include, without limitation, the potential efficacy and safety of Annamycin and AnnAraC in R/R AML, expected timing of the comprehensive Part A data readout in Q1 2027, the anticipated composition of the Part A population including the expected approximate 50/50 split between fit and unfit subjects, the potential for Part A data to support dose selection for Part B, and the expectation that interim efficacy trends observed in a limited patient population will be confirmed in the full study population. Moleculin will require significant additional financing, for which the Company has no commitments, in order to conduct its clinical trials as described in this press release, and the milestones described in this press release assume the Company’s ability to secure such financing on a timely basis. 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. The Company relies on the reports of its expert with regard to the absence of cardiotoxicity. The dataset referenced in this press release is subject to the review of the data from future subjects in its current and future clinical trials and long-term follow-up with subjects in its current trials. 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 (908) 824-0775 MBRX@jtcir.com