SELLAS Meets All Primary Endpoints in Phase 2 Trial of SLS009 in r/r AML and Receives FDA Guidance to Advance into First-Line Therapy Study

Core Insights - SELLAS Life Sciences Group has successfully met all primary endpoints in its Phase 2 trial of SLS009 (tambiciclib) for relapsed/refractory acute myeloid leukemia (r/r AML) [1][3][4] Trial Design and Objectives - The Phase 2 trial was an open-label, single-arm, multi-center study assessing the safety, tolerability, and efficacy of SLS009 in combination with venetoclax and azacitidine at two dose levels: 45 mg and 60 mg [2] - The trial aimed for a target overall response rate (ORR) of at least 20% and a median survival of at least 3 months [2] Efficacy Results - The trial exceeded the target ORR of 20%, achieving an ORR of 44% among AML MR patients at the optimal 30 mg twice a week (BIW) dose and 50% in ASXL1-mutated AML MR patients [6][12] - Median overall survival (mOS) was reported at 8.9 months for AML MR patients and 8.8 months for those refractory to venetoclax-based regimens, significantly surpassing historical benchmarks of 2.4 months [6][12] Safety Profile - SLS009 was well tolerated, with no dose-limiting toxicities observed across all treatment arms, validating its safety profile [9][12] Future Development Plans - Based on the positive Phase 2 results, the company plans to advance SLS009 into a randomized trial targeting newly diagnosed AML populations, with enrollment expected to begin by Q1 2026 [3][10][13] - The upcoming trial will include two cohorts: one for patients unlikely to benefit from standard therapy based on molecular profiling and another for patients showing early resistance to treatment [13][14] Industry Context - The results from the trial highlight a significant advancement in treatment options for patients with r/r AML, addressing a critical unmet medical need in this patient population [11][12]