Successful conservative management for early-stage low-grade endometrial cancer in young women wishing to preserve fertility has been reported in small series. Although few data are available on assisted reproductive technology (ART) outcomes after conservative management of endometrial carcinoma, ART does not seem to worsen prognosis. We report the case of a 29-year-old woman with a history of primary infertility, who was diagnosed with a well-differentiated endometrial adenocarcinoma (stage Ia), which was treated with high doses of oral progesterone. A successful pregnancy was achieved after ART.