...113 pts (cohort 1, n=90; cohort 2, n=23) were enrolled. Median age was 54 yr (range: 34-79), 25.6% (n=29) of pts had received ≥4 prior systemic chemotherapy lines, and 54.0% (n=61) of pts had an ECOG score of 1 at study entry. At data cutoff, median follow-up was 12.2 mo (range: 0.2-21.5). Across both cohorts, pamiparib showed preliminary antitumor activity (Table). In cohort 1, confirmed ORRIRC was 64.6%, median DoR was 14.5 mo (95% CI, 11.1-NE), progression-free survival (PFS) was 15.2 mo (95% CI, 10.35-NE), and median overall survival (OS) was not yet mature...Promising antitumor activity was observed in pts with platinum-sensitive/resistant aOC. Pamiparib was generally tolerated...