Testing Olaparib for One or Two Years, With or Without Bevacizumab, to Treat Ovarian Cancer

Inclusion Criteria: * Patients with newly diagnosed, pathologically confirmed, Federation of Gynecology and Obstetrics (FIGO) stage III or IV ovarian cancer of the following types: * High grade serous * High grade endometrioid, and/or * Other epithelial ovarian cancer with BRCA1/2 deleterious alteration (germline or somatic) * Submission of pathology report is required * Ovarian cancer = ovarian, fallopian, or primary peritoneal cancer * Patients must have: * Documented variant (tumor or germline) in BRCA1 or BRCA2 that is predicted to be pathogenic or suspected pathogenic (deleterious alteration) * Submission of testing report is required. OR * BRCA 1/2 wildtype AND known HRD deficient tumor determined by any commercial or academic, Clinical Laboratory Improvement Act (CLIA)-certified laboratory (e.g., Myriad MyChoice©) * Submission of testing report is required * Patient must have undergone cytoreductive surgery (primary or interval) * Patients must have completed first line platinum-based therapy prior to registration: * Platinum based chemotherapy course must have consisted of a minimum of 4 treatment cycles and a maximum of 9, although it is strongly recommended that patients receive at least 6 cycles unless medically contraindicated * For those receiving less than 6 cycles of platinum-based therapy, the reason for this must be documented and could include hematologic toxicity or non-hematologic toxicities directly related to therapy …