NEW YORK, June 23, 2017 (GLOBE NEWSWIRE) -- Stemline Therapeutics, Inc. (Nasdaq:STML), a clinical-stage biopharmaceutical company developing novel therapeutics for difficult to treat cancers, announced the presentation today of updated clinical data from Stages 1 and 2 of the ongoing SL-401 pivotal Phase 2 clinical trial in blastic plasmacytoid dendritic cell neoplasm (BPDCN), along with safety data from the entire SL-401 clinical program, at the 22 nd Congress of the European Hematology Association (EHA) being held in Madrid, Spain.

A summary of the presentation is as follows:
  • Stages 1 and 2 enrolled 32 BPDCN patients, of which 19 were first-line and 13 patients were relapsed/refractory.
  • Median age was 72 years (range 29-85 years).
  • The most common treatment-related adverse events (TRAEs) with SL-401 across BPDCN and other indications (n=134 patients) were hypoalbuminemia (43%), transaminitis (43%), and thrombocytopenia (26%), by investigator-assessment. TRAEs included capillary leak syndrome (18%), of which 3 cases were grade 5 (2.2%), as previously reported.
  • The overall response rate (ORR) for Stage 1 and 2 BPDCN patients (n=32) was 84%, with a complete response (CR) rate of 59%, by investigator-assessment.
  • Eight BPDCN patients who achieved remission on SL-401 (for ~2.5 to ~6 months duration) were subsequently bridged to stem cell transplant, including one relapsed/refractory patient.
  • In first-line BPDCN patients treated at 12 ug/kg/day (n=16), the median overall survival (OS) has not been reached.

The full presentation will be available on the Stemline website (, under the "Scientific Presentations" tab, following delivery of today's presentation at EHA.

Stage 3 is fully enrolled (n=13 first-line BPDCN patients) and data will be reported, along with further updated Stage 1 and 2 data, in 2H17. Depending on the results of this ongoing Phase 2 trial, the largest prospective study ever conducted in this indication (n=45 patients), we intend to file a BLA for SL-401 in BPDCN in 4Q17/1Q18.

About Stemline Therapeutics Stemline Therapeutics, Inc. is a clinical stage biopharmaceutical company developing novel therapeutics for difficult to treat cancers. A Phase 2 pivotal trial with SL-401, a targeted therapy directed to the interleukin-3 receptor (CD123), has completed enrollment of patients with blastic plasmacytoid dendritic cell neoplasm (BPDCN) in the Stage 3 cohort, and patients continue to be treated and followed. SL-401 has been granted Breakthrough Therapy Designation (BTD) for the treatment of BPDCN. Additional Phase 1/2 trials with SL-401 are enrolling patients with other malignancies including myeloproliferative neoplasms (MPN) (chronic myelomonocytic leukemia [CMML] and myelofibrosis [MF]) and acute myeloid leukemia (AML) in remission with minimal residual disease (MRD). A Phase 1/2 trial of SL-401 in combination with pomalidomide is enrolling patients with relapsed/refractory multiple myeloma. A Phase 1 dose escalation trial with SL-801, a novel oral small molecule reversible inhibitor of XPO1, is enrolling patients with advanced solid tumors. A Phase 2 trial with SL-701, an immunotherapy designed to activate the immune system to attack tumors, has completed dosing and patients with second-line glioblastoma are being followed for survival.

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