SEELAS Life Sciences (US:SLS) Globenewswire·2025-12-07 23:00Core Insights - SELLAS Life Sciences Group, Inc. announced promising clinical data for SLS009, a CDK9 inhibitor, in combination with azacitidine and venetoclax for treating relapsed or refractory acute myeloid leukemia with myelodysplastic syndrome-related changes [1][3] Group 1: Clinical Study Details - The Phase 2 study involved 35 evaluable patients with a median age of 69, where 98% had ELN adverse-risk AML, with common mutations including ASXL1, RUNX1, TP53, and SRSF2 [2] - The overall response rate for SLS009 in combination with AZA/VEN was 46%, with 29% achieving complete response (CR) or CR with incomplete blood count recovery (CRi) [3] - Patients with ASXL1 and TP53 mutations had response rates of 48% and 57%, respectively, with median overall survival (mOS) significantly exceeding the expected 2.6 months [3] Group 2: Safety and Tolerability - No dose-limiting toxicities (DLTs) or treatment-related deaths were reported, indicating that the combination therapy was well tolerated [3][5] - The combination therapy demonstrated a median overall survival of 8.9 months in the least pretreated cohort, with a 58% response rate in patients with one prior line of therapy [5] Group 3: Future Plans and Implications - The company plans to expand the study to evaluate SLS009 plus AZA/VEN in newly diagnosed AML with high-risk features in Q1 2026 [5] - The results suggest that SLS009 may effectively overcome resistance to venetoclax-based regimens by targeting MCL-1, a key resistance mechanism in AML [4]