It has been three years since niraparib was introduced into Korea, and about 600 Korean patients with epithelial ovarian cancer have been treated with this drug. The efficacy and safety of niraparib in primary and recurrent epithelial ovarian cancer were well demonstrated in the NOVA trial and the PRIMA trial, and the efficacy and safety of niraparib in heavily pretreated epithelial ovarian cancer patients were confirmed in the -QUADRA trial. However, safety and efficacy data in Korean women are still scanty. The purpose of this study was to evaluate the safety and efficacy of niraparib in Korean women with primary and recurrent epithelial ovarian cancer.