Background: High-grade serous epithelial ovarian cancer is a disease with a poor prognosis in the advanced stages (stages III and IV). For patients with no biomolecular abnormalities, there are two maintenance treatments available after first-line chemotherapy: bevacizumab or niraparib. There is no prospective or strong retrospective study comparing these two therapies. Hypothesis: Patients receiving bevacizumab are different from those receiving niraparib.

Objective: To compare the progression-free survival (PFS) of patients with high-grade stage III and IV ovarian carcinoma who received chemotherapy with those who received maintenance treatment with bevacizumab and those who received niraparib. Method: Retrospective, multicenter study based on data collected from the patient's medical record. Eligible patients are all patients diagnosed with de novo high-grade serous epithelial ovarian carcinoma who have received first-line platinum-based chemotherapy followed by maintenance treatment with bevacizumab or niraparib. All eligible patients will be included. Patients with a BRCA mutation and/or a positive HRD score will be excluded. Data will be collected using an electronic CRF. The inclusion period is from October 2020 to December 2023.