Inclusion Criteria:  Patient Study Information and written informed consent Social Security Affiliation Patient > 18 years old. Ovarian, tubular or peritoneal high-grade epithelial carcinoma, histologically proven. Recommendation of a maintenance treatment with Niraparib at standard dose (200-300mg/day) Glomerular filtration rate with standardized serum creatinine values using CKD-EPI formula ≥ 30ml/min/1.73m2 (https://www.kidney.org/professionals/kdoqi/gfr_calculator) Normal liver function with bilirubin < 1.5N 6-8 weeks break between last chemotherapy and Niraparib treatment initiation. Patient with an effective birth control  Exclusion Criteria:  Minor patient Patient not able to understand the aim of the study or under curatorship Low grade carcinoma Pregnant or breastfeeding patient Hypersensivity to an active substance present in niraparib