Metastatic breast cancer (mBC) patients with pathogenic germline BRCA 1/2 (gBRCA1/2) mutation, somatic BRCA 1/2 (sBRCA 1/2), ATM, PALB2, or RAD51C were enrolled….Patients were administered with venadaparib doses ranging from 120mg to 240mg, based on emerging data from ongoing phase 1a dose finding study....Of the 10 evaluable patients (8 gBRCAmt and 2 sBRCAmt), 1 patient had complete response (CR), 7 patients had partial responses (PR) and 2 patients had stable disease (SD), leading to 80% ORR and 100% DCR.