SELLAS Presents Preclinical Efficacy of SLS009 in ASXL1 Mutated Colorectal Cancer at 2025 ASCO Annual Meeting

Core Insights - SELLAS Life Sciences Group, Inc. announced preclinical efficacy of SLS009 (tambiciclib) in ASXL1 mutated colorectal cancer, highlighting its potential as a targeted therapy [1][2] - The presentation at the 2025 ASCO Annual Meeting emphasized the selective targeting of ASXL1-driven tumors, suggesting ASXL1 mutation status could serve as a biomarker for treatment response [2][3] Company Overview - SELLAS is a late-stage clinical biopharmaceutical company focused on developing novel therapies for various cancer indications, with SLS009 being a key candidate [4][5] - The company is also developing GPS, a product licensed from Sloan Kettering Cancer Center, aimed at addressing a broad spectrum of hematologic malignancies and solid tumors [5] Clinical Study Details - SLS009 is currently undergoing a Phase 2 open-label, single-arm, multi-center study to evaluate its safety, tolerability, and efficacy in combination with venetoclax and azacitidine for AML patients with ASXL1 mutations [3] - Initial clinical safety and efficacy data are available, and the study aims to identify biomarkers for patient selection [3] Efficacy Data - In a panel of ASXL1 mutant cell lines, 50% showed an IC50 <100 nM, indicating strong anti-proliferative activity, compared to 0% in ASXL1 wild-type lines [4] - Among cell lines with ASXL1 frameshift mutations, 75% responded with IC50 <100 nM, demonstrating a steep dose-response curve [4]