- PHASE II: Participants must have histologically or cytologically grade 2 or 3 (high-grade) papillary-serous or endometrioid epithelial ovarian cancer, primary peritoneal serous cancer, or fallopian tube cancer; participants with epithelial ovarian, primary peritoneal, or fallopian tube cancers of other high-grade histologies who carry a known deleterious breast cancer gene (BRCA) germline mutation by standard clinical testing (Myriad BRAC Analysis) will also be considered eligible