ZEJULA is a poly(ADP-ribose) polymerase (PARP) inhibitor indicated:...for the treatment of adult patients with advanced ovarian, fallopian tube, or primary peritoneal cancer who have been treated with three or more prior chemotherapy regimens and whose cancer is associated with homologous recombination deficiency (HRD) positive status defined by either:...a deleterious or suspected deleterious BRCA mutation, or...genomic instability and who have progressed more than six months after response to the last platinum-based chemotherapy.

...- Participants must have high-grade serous or endometrioid or high-grade predominantly serous or endometrioid histology, regardless of homologous recombination deficiency (HRD) or germline breast cancer susceptibility gene (gBRCA) mutation status....

...Participants must agree to undergo tumor homologous recombination deficiency/deficient (HRD) testing, and this test result must show that participants have an HRD-positive tumor (defined by the presence of a deleterious or suspected deleterious breast cancer gene (BRCA) mutation or be positive for genomic instability) by the central laboratory selected by the sponsor....

...The safety objective is to characterize the safety and tolerability of 3 vs. 6 cycles of chemotherapy followed by maintenance therapy with niraparib in advanced HRDpositive high-grade ovarian cancer patients with no residual tumor mass following primary tumor debulking. ...