Postoperative radiation therapy for epithelial ovarian cancer: the curative role based on a 24-year experience

Abstract

We updated 152 cases of epithelial ovarian cancer, International Federation of Gynecology and Obstetrics (FIGO) stages I through III, treated at the Stanford Medical Center (Stanford, Calif) with irradiation as the only postoperative therapy. In 133 patients, radiation was directed only to those regions of known disease, while it was delivered to the whole abdomen and pelvis by the Martinez technique in 19 patients. Mean follow-up time was 6.8 years. The results were analyzed as freedom from relapse (FFR) at 15 years; overall, FFR constituted 44% of the patients. Statistically significant differences of FFR appeared between stages II (60%) and III (16%); among the histopathologic variants endometrioid (64%), serous papillary (45%), and undifferentiated (7%); between pathologic grades 2 (68%) and 3 (20%); between amounts of postoperative residual disease less than 2 cm (48%) and greater than 2 cm (16%); and between ages less than 40 (80%) and greater than or equal to 40 (38%). Considering all stages and grades together, FFR in the 54 cases with unfavorable residuum (greater than 2 cm) was 14%. Among the 98 with favorable residuum (none, or less than 2 cm) FFR was 62%; and 14 (39%) of the 36 relapses were in the untreated upper abdomen. Results in the favorable group support effectiveness of irradiation as postoperative therapy. These patterns of relapse suggest that whole-abdominopelvic irradiation would further increase FFR. We believe that, for favorable disease as defined such radiotherapy should be the standard for comparison.