ORIC® Pharmaceuticals Announces Completion of Dose Exploration Portion of ORIC-944 Phase 1b Clinical Trial and Continues to Demonstrate Potential Best-in-Class Efficacy and Safety

Core Insights - ORIC Pharmaceuticals announced additional efficacy and safety data from the Phase 1b trial of ORIC-944 in combination with androgen receptor inhibitors for metastatic castration-resistant prostate cancer (mCRPC) [1][2] Efficacy Data - The trial demonstrated a 55% PSA50 response rate and a 20% PSA90 response rate among patients [6] - Rapid and deep circulating tumor DNA (ctDNA) reductions were observed in 76% of patients, with 59% achieving ctDNA clearance, indicating potential long-term treatment benefits [1][7] - PSA responses and ctDNA reductions were consistent across all ORIC-944 dose levels and in combination with both apalutamide and darolutamide [4][5] Safety Profile - The combination of ORIC-944 with apalutamide or darolutamide showed a safety profile compatible with long-term dosing, with most adverse events being Grade 1 or 2 [8] - As of the cutoff date, only one patient experienced a Grade 3 treatment-related adverse event, with no Grade 4 or 5 adverse events reported [8] Next Steps - ORIC has selected provisional recommended Phase 2 doses for ORIC-944 to be tested in combination with darolutamide and apalutamide, with ongoing enrollment in the dose optimization portion of the trial [9] - Preliminary dose optimization data is expected to be announced in Q1 2026, ahead of initiating the first global Phase 3 registrational trial in mCRPC in the first half of 2026 [2][9] Company Overview - ORIC Pharmaceuticals is focused on developing treatments that address mechanisms of therapeutic resistance in cancer, with ORIC-944 being an allosteric inhibitor of the polycomb repressive complex 2 (PRC2) [11]