Recurrence, death, and secondary malignancy after ovarian conservation for young women with early-stage low-grade endometrial cancer.

•Outcomes following ovarian conservation (OC) for young women with early-stage low-grade endometrial cancer•OC rate: increased in US cohort but not in Japan cohort•Recurrence after OC: increased in the Japan cohort but not increased in the US cohort•Secondary primary cancer after OC: increased in the Japan cohort (ovarian cancer), but not increased in the US cohort•Overall survival after OC: similar to oophorectomy in both cohorts