Moleculin Biotech Inc (MBRX)

[Dennisb68]

Moleculin Announces Additional Positive Interim Results from Phase 1/2 Clinical Studies of Annamycin in Acute Myeloid Leukemia

No evidence of cardiotoxicity to date; 40% of 10 patients dosed at 120 mg/m2 demonstrate efficacy; trial progresses in Europe to 210 mg/m2

HOUSTON, TX - December 4, 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 additional positive interim safety and efficacy data from one of the Company’s two ongoing open label, single arm Phase 1/2 studies of Annamycin for the treatment of relapsed or refractory acute myeloid leukemia ("AML").

The Phase 1 portion of these clinical trials, which are described in more detail later in this press release, is designed to establish the safety of Annamycin and to determine the Recommended Phase 2 Dose to be used in the Phase 2 portion of the trials. While the Primary Endpoint of the Phase 1 portion is safety, a Secondary Endpoint is the assessment of efficacy generally defined as an improvement in bone marrow biopsy results sufficient to qualify patients for a potentially curative bone marrow transplant. The Company cautions not to place undue reliance on interim results.

The third cohort in Poland receiving a single dose of 180 mg/m2 in the Phase 1 dose escalation portion of the trial was completed with no adverse events and the trial will continue to the next cohort of 210 mg/m2. In the US trial, one patient has completed treatment in the second cohort at 120 mg/m2. This brings the total number of patients treated and evaluated at or above 120 mg/m2 to 10. An additional patient in the US has begun treatment at 120 mg/m2 but has yet to complete post-treatment evaluation. The interim results for these 10 patients are 1 CRi (defined as a complete response with incomplete recovery of white blood cells and/or platelets) and 2 partial responses ("PRs" or where bone marrow blasts are reduced 50% and to below 25%). One additional patient was bridged to bone marrow transplant ("BT") based on a sufficient reduction in bone marrow blasts, bringing the total to 4 out of 10 patients at or above 120 mg/m2 who have demonstrated efficacy.

In the latest cohort in Poland, 1 of the 3 patients treated at 180 mg/m2 had a PR sufficient to qualify for a potentially curative bone marrow transplant. The results for all 3 patients were reviewed by the Safety Review Committee, which determined that no drug-related adverse events were observed that would prevent advancing the trial to the next higher dose level of 210 mg/m2. To date in the European trial, only one adverse event related to Annamycin has been reported; a patient experienced grade 2 mucositis (which resolved to grade 1 within 2 days). In the Company’s parallel US clinical trial, one new patient (the first of cohort #2) achieved a "morphologically leukemia free state" or MLFS, which also constitutes a CRi, after receiving a single dose of 120 mg/m2.