Fertility-sparing treatment in advanced-stage serous borderline ovarian tumors. An analysis from the MITO14 study database

Objectives: To evaluate oncological and reproductive outcomes of women undergoing fertility-sparing surgery (FSS) for stage II–III serous borderline ovarian tumors (BOTs). Methods: A multi-institutional retrospective study was conducted within the MITO Group. Results: A total of 91 patients were recruited. The median follow-up time from primary cytoreduction was 127 months (IQR range 91–179). Forty-nine patients (53.8%) experienced at least one recurrence (median time to first relapse 22 months, IQR range 9.5–57). At univariable analysis, significant predictors of relapse were: size of largest extra-ovarian lesion, peritoneal cancer index, completeness of cytoreduction, type of implants. After multivariable analysis, the size of extra-ovarian lesions and the presence of invasive implants resulted as the only independent predictors of recurrence. Median disease-free survival (DFS) was 96 months (95% CI, 24.6–167.3), while median disease-specific survival (DSS) was not reached. Twenty-nine patients (31.8%) attempted to conceive: 20 (68.9%) achieved at least one pregnancy and 18 (62%) gave birth to a healthy child. At the end of the observation period, 88 patients (96.7%) showed no evidence of disease, 2 (2.2%) were alive with disease, and 1 patient (1.1%) died from BOT. Conclusions: Despite the recurrence high rate, FSS provides good chances of reproductive success with no impact on DSS. The presence of invasive peritoneal implants affects the DFS but not DSS nor reproductive outcome. The risk of recurrence would not seem to be related to the ovarian preservation per se, but to the natural history of the initial peritoneal spread.