Benefit of adjuvant radiotherapy in surgically staged stage I-II endometrial carcinoma

This study was performed to determine the treatment outcomes and patterns of failure following external beam therapy in patients with pathological stage I-II endometrial carcinoma.

Eighty-three patients with stage I-II endometrial carcinoma surgically staged who were found to have high risk factors and who received postoperative radiation therapy are the subject of this report. High risk factors were: histologic grade II-III, depth of myometrial invasion (DMI) > or =1/2, stage II, poor prognostic histology (clear cell, papillary serous cell) and lymphovascular invasion.

Recurrences were observed in six patients. The recurrences were located in the vagina (1), lung (2), liver (1), and paraaortic lymph nodes (1). Five of the six recurrences were stage IC and II. The overall survival (OS), cause-specific survival (CSS) and disease-free survival (DFS) at five years were 82.9%, 85.0% and 81.3%, respectively. DMI, grade, age and cervical stromal invasion had a significant impact on CSS.

Adjuvant radiotherapy decreases the rate of relapse in pathologically staged high-risk stage I-II endometrial carcinoma patients. After reviewing the other studies on this subject we conclude that vaginal cuff brachytherapy alone could be used in stage IA grade III and stage IB grade I-II patients because the recurrence rate is low; pelvic radiotherapy + vaginal cuff brachytherapy should be used for stage IC-II disease. Distant metastases occurred in five of our patients and represent a significant type of failure.