Survival and reproductive outcomes after fertility-sparing surgery performed for borderline epithelial ovarian tumor in Japanese adolescents and young adults: Results of a retrospective nationwide study.

Post-FFS outcomes in terms of overall and progression-free survival are favorable, especially for AYA patients with stage I BOT. However, the relapse rate is high for patients with FIGO stage II-IV and for those with stage I but a positive peritoneal cytology. A long-term prospective observation is needed before reproductive outcomes can be fully established.