Moleculin Announces Positive Interim Results in First Cohort of Phase 1/2 Clinical Studies of Annamycin in Acute Myeloid Leukemia in the US and in Poland

HOUSTON, March 26, 2019 — Moleculin Biotech, Inc., (Nasdaq: MBRX) (“Moleculin” or the “Company”), a clinical stage pharmaceutical company with a broad portfolio of drug candidates targeting highly resistant tumors, today announced positive interim safety and efficacy data from two ongoing open label, single arm Phase 1/2 studies of Annamycin. In the first study, being conducted in the US, four patients have completed treatment at 100 mg/m2 with no significant adverse events related to Annamycin, and the study will now proceed to the next higher dose of 120 mg/m2. The second trial, taking place in Poland, started at a 120 mg/m2 dose of Annamycin and has treated three patients. The first patient treated in that trial received a single course of Annamycin and his bone marrow blasts have reduced from 60% to 11%. Our principal investigator considers this response sufficient for the patient to proceed to consolidation therapy, with the goal of receiving a potentially curative bone marrow transplant. To date in Poland, one patient experienced grade 2 mucositis (which resolved to grade 1 within 2 days) and no other adverse events related to Annamycin have been reported. Trial results for the other two patients treated in Poland will not be known until the second quarter of this year.

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