Fulcrum Therapeutics Announces Results from the 12 mg Dose Cohort of the Phase 1b PIONEER Trial of Pociredir in Sickle Cell Disease

Core Insights - Fulcrum Therapeutics reported positive results from the 12 mg dose cohort of the Phase 1b PIONEER trial for pociredir in sickle cell disease (SCD) [2][3] Efficacy Data - The mean absolute fetal hemoglobin (HbF) increased by 8.6% from a baseline of 7.6% to 16.2% after 12 weeks of treatment, with 7 out of 16 patients achieving HbF levels greater than 20% [4][10] - The proportion of F-cells increased from 34% at baseline to 67% at 12 weeks, indicating pan-cellular induction of HbF [4][10] - Key markers of hemolysis showed meaningful improvements, including a mean increase in total hemoglobin of 0.9 g/dL, from 7.8 g/dL to 8.7 g/dL [10] - A trend of reduced vaso-occlusive crisis (VOC) rates was observed, with 50% of patients reporting no VOCs during the treatment period [10] Safety Profile - Pociredir was generally well-tolerated, with no treatment-related serious adverse events (SAEs) reported, and all treatment-related adverse events (AEs) were Grade 1 [3][10] - The safety profile observed in the 12 mg dose cohort was consistent with previously reported data [10] Company Overview - Fulcrum Therapeutics is focused on developing small molecules for genetically defined rare diseases, with pociredir as its lead clinical program aimed at increasing HbF expression for SCD treatment [8][9]