Maintenance Treatment With BGB-290 Versus Placebo in Participants With Platinum-sensitive Recurrent Ovarian Cancer

Key Inclusion Criteria: 1. Histologically diagnosed high-grade serous or endometrioid ovarian cancer (including primary peritoneal and fallopian tube cancer) 2. Completion of ≥2 previous platinum-containing regimens (eg, carboplatin or cisplatin) 3. Complete response (CR) or partial response (PR) achieved with last platinum-based chemotherapy regimen as determined by investigator per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 4. Ability to be randomized ≤8 weeks after last dose of platinum Key Exclusion Criteria: 1. Prior treatment with a poly (ADP-ribose) polymerase (PARP) inhibitor 2. Progressive disease (PD) as per CA-125 criteria before randomization 3. Diagnosis of myelodysplastic syndrome (MDS) 4. Known history of intolerance to the excipients of the Pamiparib capsule NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.