Cytarabine

– 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 2nd 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 MadridHOUSTON, 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. Continue Reading Preliminary Results Across All Lines of Treatment Median Durability of Response Response by Genotype and Mutations To date, a total of 22 subjects have been enrolled (the Intent-to-Treat population, ITT), 20 (Lines 1st-7th) 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 2nd line setting, 5 achieved a CR (50%) and 6 achieved a CRc (60%). Of the 13 subjects in the ITT evaluable population that were 1st or 2nd 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 2nd 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 2nd line patients continues to significantly exceed the performance reported by any drug currently approved for use in 2nd 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.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 and connect on Twitter, LinkedIn and Facebook. Forward-Looking StatementsSome 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 [email protected] SOURCE Moleculin Biotech, Inc.

- Data continue to support revumenib's potential to enhance current standard of care agents - - 96% CRc (23 of 24 pts) observed in BEAT AML trial exploring revumenib in combination with venetoclax/azacitidine in newly diagnosed mNPM1 or KMT2Ar AML - - 52% CRc (14 of 27 pts) observed in AUGMENT-102 trial of revumenib in combination with fludarabine-cytarabine in acute leukemia patients with R/R mNPM1, NUP98r or KMT2Ar - WALTHAM, Mass., June 14, 2024 /PRNewswire/ -- Syndax Pharmaceuticals (Nasdaq: SNDX), a clinical stage biopharmaceutical company developing an innovative pipeline of cancer therapies, today announced updated data from multiple combination trials of revumenib, the Company's potent, selective, small molecule menin inhibitor, in patients with acute leukemias. The updated data are being presented at the European Hematology Association (EHA) 2024 Congress, being held June 13-16 in Madrid, Spain and virtually. "The growing body of data supports the potential for revumenib to have a meaningful impact in combination with current standard of care therapies," said Joshua F. Zeidner, M.D., Chief, Leukemia Research at the University of North Carolina, Lineberger Comprehensive Cancer Center. "Based on the BEAT AML data in the newly diagnosed setting which showed a high rate of MRD-negative responses coupled with a safety profile that enables combination use, revumenib has the potential to become a cornerstone of treatment as front-line therapy for newly diagnosed KMT2Ar and mNPM1 AML." "We are committed to advancing revumenib across a spectrum of acute leukemia patients. As we prepare for the expected near-term approval of revumenib in the relapsed or refractory setting, we look forward to providing additional clinical data as monotherapy and in combination to support treatment in various acute leukemia treatment settings where novel treatment options are urgently needed," said Neil Gallagher, M.D., Ph.D., President, Head of Research and Development at Syndax. BEAT AML Trial The Company announced updated data from the BEAT AML trial of revumenib in combination with venetoclax/azacitidine in newly diagnosed mutant nucleophosmin (mNPM1) or KMT2A-rearranged (KMT2Ar) acute myeloid leukemia (AML) patients aged 60 years or older in an oral presentation titled "Phase 1b Study of Azacitidine, Venetoclax and Revumenib in Newly Diagnosed Older Adults with NPM1 Mutated or KMT2A Rearranged AML: Interim Results of Dose Escalation from the BeatAML Consortium." The dose escalation phase of the trial tested revumenib at doses of 113 mg and 163 mg q12h in combination with a strong CYP3A4 inhibitor beginning on day 1 of a 28-day cycle in combination with on label doses of venetoclax and azacitidine. As of the data cutoff date of May 1, 2024, 26 newly diagnosed mNPM1 (n=17) or KMT2Ar (n=9) AML patients were enrolled. In the efficacy evaluable population, the composite complete remission1 (CRc) rate was 96% (23/24) and 92% (22/24) of patients also attained minimal residual disease (MRD) negative status as determined by central flow cytometry. Three patients proceeded to hematopoietic stem cell transplant (HSCT). The first cohort of patients treated in the trial, at 113 mg, had extended follow-up and an estimated 12-month survival of 100%. Revumenib was dosed safely at both the 113 mg and 163 mg q12h dose in combination with venetoclax and azacitidine. 15% (4/26) of patients experienced differentiation syndrome with one (4%) Grade 3 event. 46% (12/26) of patients experienced QTc prolongation with three (12%) Grade 3 events. All DS and QTc prolongations were self-limiting and resolved without complication or the need for revumenib dose reductions. Venetoclax was dosed in accordance with its label and an analysis of the onset and extent of hematologic toxicities suggest a similar experience to what has been reported for the venetoclax/azacytidine doublet. Overall, there were no new or increased safety signals observed when revumenib was added to this triplet combination. An expansion cohort is ongoing at both dose levels to establish the recommended dose for future trials. The Company plans to initiate a pivotal trial with this combination in front-line newly diagnosed patients by year-end 2024. AUGMENT-102 Trial The Company also announced a poster presentation featuring updated data from the AUGMENT-102 trial of revumenib in combination with fludarabine/cytarabine in a predominantly pediatric population of patients with relapsed/refractory (R/R) mNPM1 (n=2), NUP98-rearranged (NUP98r) (n=1) or KMT2Ar (n=23) AML titled "Safety and Activity of Revumenib in Combination with Fludarabine/Cytarabine (FLA) in Patients with Relapsed/Refractory Acute Leukemias." As of the data cutoff date of January 15, 2024, 27 patients received revumenib plus FLA, including 9 patients treated at 113 mg q12h and 18 treated at 163 mg q12h. The patients enrolled had a median age of 6 years and had received a median of 3 prior lines of therapy. Eighteen (67%) patients had prior FLA containing regimens while 11 (41%) patients had prior HSCT. Five (56%) patients treated at the 113 mg q12h dose and nine (50%) patients treated at the 163 mg q12h achieved a CRc. Most patients who achieved a CRc and had evaluable data achieved (MRD) negative status (10/14; 71%) and 7 patients underwent HSCT while in remission following treatment. Overall, revumenib was tolerable in heavily pretreated patients with KMT2Ar, NUP98r, or NPM1m acute leukemias without increased frequency or severity of AEs compared with historic FLA data or revumenib monotherapy. One DLT occurred at the 163 mg q12h dose that was a Grade 4 decreased neutrophil count in a patient with multiple prior transplants. Grade 3 and above adverse events in over 40% of patients included decreased platelet count (17/27; 63%), anemia (15/27; 56%) and febrile neutropenia (13/27; 48%). Lower rates of cytopenias were reported at the 163 mg q12h dose than the 113 mg q12h dose, consistent with faster remission at the higher dose. Lower rates of nonhematologic adverse events were also observed at the higher dose level, which further suggests that the adverse event profile was not driven by revumenib. There was one adverse event leading to death (sepsis at the 113 mg q12h dose level) not related to revumenib. There were no cases of differentiation syndrome in the trial. This study supports the selection of revumenib 163 mg q12h (95 mg/m2 q12h if weight <40 kg) combined with FLA and a strong cytochrome P450 inhibitor as the RP2D, in line with the dose of revumenib under FDA review as a monotherapy agent. Additional Presentations at EHA 2024 In addition to updated results from the BEAT AML and AUGMENT-102 studies, an encore presentation of results from the pivotal AUGMENT-101 study of revumenib in R/R KMT2Ar acute leukemia were also featured at the Congress during an oral session titled "Revumenib Monotherapy in Patients with Relapsed/Refractory KMT2Ar Acute Leukemia: Topline Efficacy and Safety Results from the Pivotal AUGMENT-101 Phase 2 Study." Results from an exploratory analysis of immunophenotypic changes in AML blasts following treatment with revumenib were also featured in a poster presentation titled "Characterization of Immunophenotypic Changes Following Menin Inhibition in Acute Myeloid Leukemia." Copies of EHA posters and presentations will be available in the Publications and Meeting Presentations section of Syndax's website. About Revumenib Revumenib is a potent, selective, small molecule inhibitor of the menin-KMT2A binding interaction that is being developed for the treatment of KMT2A-rearranged (KMT2Ar), also known as mixed lineage leukemia rearranged or MLLr, acute leukemias including ALL and AML, and mutant nucleophosmin (mNPM1) AML. Positive topline results from the Phase 2 AUGMENT-101 trial in R/R KMT2Ar acute leukemia showing the trial met its primary endpoint were presented at the 65th American Society of Hematology Annual Meeting, and data from the Phase 1 portion of AUGMENT-101 in acute leukemia was published in Nature. Revumenib was granted Orphan Drug Designation by the FDA and European Commission for the treatment of patients with AML and Fast Track designation by the FDA for the treatment of adult and pediatric patients with R/R acute leukemias harboring a KMT2A rearrangement or NPM1 mutation. Revumenib was granted Breakthrough Therapy Designation by the FDA for the treatment of adult and pediatric patients with R/R acute leukemia harboring a KMT2A rearrangement. About Syndax Syndax Pharmaceuticals is a clinical stage biopharmaceutical company developing an innovative pipeline of cancer therapies. Highlights of the Company's pipeline include revumenib, a highly selective menin inhibitor, and axatilimab, a monoclonal antibody that blocks the CSF-1 receptor. For more information, please visit or follow the Company on X (formerly Twitter) and LinkedIn. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as "anticipate," "believe," "could," "estimate," "expects," "intend," "may," "plan," "potential," "predict," "project," "should," "will," "would" or the negative or plural of those terms, and similar expressions (as well as other words or expressions referencing future events, conditions or circumstances) are intended to identify forward-looking statements. These forward-looking statements are based on Syndax's expectations and assumptions as of the date of this press release. Each of these forward-looking statements involves risks and uncertainties. Actual results may differ materially from these forward-looking statements. Forward-looking statements contained in this press release include, but are not limited to, statements about the progress, timing, clinical development and scope of clinical trials, the reporting of clinical data for Syndax's product candidates, and the potential use of its product candidates to treat various cancer indications and fibrotic diseases. Many factors may cause differences between current expectations and actual results, including: unexpected safety or efficacy data observed during preclinical or clinical trials; clinical trial site activation or enrollment rates that are lower than expected; changes in expected or existing competition; changes in the regulatory environment; failure of Syndax's collaborators to support or advance collaborations or product candidates; and unexpected litigation or other disputes. Other factors that may cause Syndax's actual results to differ from those expressed or implied in the forward-looking statements in this press release are discussed in Syndax's filings with the U.S. Securities and Exchange Commission, including the "Risk Factors" sections contained therein. Except as required by law, Syndax assumes no obligation to update any forward-looking statements contained herein to reflect any change in expectations, even as new information becomes available. References 1Composite complete remission (CRc) includes CR, CRh, CRp, and CRi CR = Complete remission CRh = Complete remission with partial hematologic recovery CRp = Complete remission with incomplete platelet recovery CRi = Complete remission with incomplete count recovery Syndax Contact Sharon Klahre Syndax Pharmaceuticals, Inc. [email protected] Tel 781.684.9827 SNDX-G SOURCE Syndax Pharmaceuticals, Inc.