Aims: This study sought to investigate the relationship between pre-treatment body-mass index (BMI) and established prognostic factors associated with endometrial cancer, as well as to assess its impact on survival in patients diagnosed with this malignancy. Methods: Patients diagnosed with endometrioid-type endometrial cancer between January 2000 and June 2010 at the medical oncology clinic, and who received treatment and follow-up at our clinic, were included in the study. The patient files and the hospital electronic database were retrospectively reviewed. The patients were divided into non-obese (BMI