Reproductive and obstetrical outcomes with the overall survival of fertile-age women treated with fertility-sparing surgery for borderline ovarian tumors in Sweden: a prospective nationwide population-based study

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To assess the efficacy of fertility-sparing surgery (FSS) in terms of reproductive outcomes by following FSS for borderline ovarian tumors (BOTs) and comparing the safety of FSS versus radical surgery (RS). Nationwide cohort study based on prospectively recorded data. Sweden. All women of reproductive age (18-40 years) treated in Sweden for stage I BOT with the use of FSS or RS from 2008 to 2015, identified in the Swedish Quality Registry for Gynecologic Cancer (SQRGC). FSS or RS. Reproductive outcomes: natural conception, use of assisted reproductive technology (ART), live birth and obstetrical outcomes. Safety outcome: overall survival (OS) rates, comparing women undergoing FSS versus RS. The FSS cohort was linked to the Swedish Medical Birth Register to identify all women who had given birth after FSS and to obtain detailed obstetrical data. For information on ART treatment, the National Quality Registry for Assisted Reproduction was consulted. OS rate comparisons were conducted by means of Kaplan-Meier estimates. Of the 277 women with BOTs, 213 (77%) underwent FSS, 183 (86%) unilateral salpingo-oophorectomy, and 30 (14%) cystectomy. Following FSS, 50 women gave birth to 62 healthy children, 8% of which were preterm. Only 20 (9%) of the women underwent ART treatment. OS was similar in women treated with FSS and RS. Natural fertility was maintained after FSS; only 9% required ART treatment. FSS was also deemed to be equivalent to RS regarding survival outcome.