Introduction and Purpose: In this study, we aim to investigate the effects of the prognostic factors related to tumour, treatment, local and regional controls, overall survival, and disease free survival in postoperative radiotherapy patients. Materials and Methods: Sixty-one patients admitted to suffering from adenocarcinom of endometrium were analyzed retrospectively following surgical operation, adjuvant radiotherapy, and brachytherapy. We evaluated the patients in trems of age, tumour differentiations, tumour stage, lymphovascular invasion, serosal invasion, myometrial invasion, endocervical invasion, adnex involvement, lymph node involvement, menopausal age, hypertension, diabetes mellitus, smoking history, parity, hormone replacement therapy, chemotherapy process, vaginal brachitherapy, the type and doses of radiotherapy and local relapses. Throughout our research, we studied how overall survival and disease-free survival are influenced by factors like age, stage, tumour differentiation, histological type, lymph node involvement, lymphovascular invasion (LVI), endocervical invasion, serosal invasion, menopausal age, hypertension, diabetes mellitus, smoking history, parity, hormone replacement therapy (HRT), operation type, depth of myometrial invasion, and adnexal involvement. Results: Fifty three patiens (87%) were exposed to total abdominal hysterectomy+bilateral saphingo oohporectomy+bilateral pelvic lymp node dissection (TAH+BSO+BPLND), while 8 patients (13%) were exposed to TAH-BSO. Thirty patients were treated by conventional methods, 23 patients were treated by conformal methods. Eight patients were treated only by brachytherapy. The five-year overall survival rate was 80.3% and disease-free survival rate was found to be 77%. Two year overall survival rate was 93.4% and disease-free survival rate was 85.2%. It was noticed that serosal invasion (p=0.034) affect overall survival. Conclusion: Postoperative radiation therapy is an effective and safe treatment option in endometrium cancer.