Platinum-free Interval May Predict Duration of Maintenance Bevacizumab and Survival in Platinum-sensitive Recurrent Ovarian Cancer.

ABSTRACT

BACKGROUND/AIM: We investigated factors affecting the long-term duration of bevacizumab-based maintenance therapy (BMT) and survival in patients with the first platinum-sensitive recurrence of ovarian cancer (PSR). PATIENTS AND METHODS: We included patients with the first PSR in two tertiary centers from January 2015 till August 2021. All patients received six cycles of paclitaxel, carboplatin, and bevacizumab followed by BMT. We collected data including age at recurrence, histologic types, the status of BRCA mutation, platinum-free interval (PFI), extent of secondary cytoreductive surgery (SCS), presence of extra-abdominal disease, numbers of recurred lesions, cycles of BMT, progression-free survival (PFS), and cancer-specific survival (CSS). The median cycles of BMT were 13 (range=1-108). RESULTS: A total 103 patients were included, who consisted of the short-term (<13 cycles; n=49; 47.6%) and long-term users of BMT (≥13 cycles; n=54; 52.4%). High-grade serous carcinoma (HGSC), PFI >12 months, and optimal cytoreduction during SCS were favorable factors for the long-term duration of BMT. Moreover, PFI >12 months and the long-term duration of BMT were factors for improved PFS, and HGSC and PFI >12 months were related to improved CSS. CONCLUSION: PFI >12 months may be associated with the long-term duration of BMT and improved survival in patients with the first PSR.