Pathologic stage I-II endometrial carcinoma in the elderly: Radiotherapy indications and outcome

Abstract

Purpose To assess the indications for, and the outcome of, adjuvant radiotherapy (RT) in elderly patients with pathologic Stage I-II endometrial carcinoma. Methods and materials Between 1980 and 2001, 79 elderly (age ≥75 years) patients with pathologic Stage I-II endometrial carcinoma were seen at our institution. All underwent total abdominal hysterectomy and bilateral salpingo-oophorectomy with assessment of peritoneal cytology. Pelvic and paraaortic lymph node sampling was performed in 39 and 29 women, respectively. Patients with Stage IA and IB Grade 1-2 were designated as low risk; those with Stage IB Grade 3 and IC-IIB were designated as high risk. Thirty-four received adjuvant RT consisting of whole pelvic ( n = 23) or vaginal brachytherapy ( n = 3), or both ( n = 8). Actuarial disease-free survival, cause-specific survival, and pelvic recurrence-free survival analyses were performed by the Kaplan-Meier method. Results Adverse factors were common, including deep (>50%) myometrial invasion (47%), Grade 3 disease (28%), cervical involvement (15%), and unfavorable histologic features (15%). Overall, 46 patients (58%) had high-risk disease. Primarily because of concerns over toxicity, RT was administered in only 73%, 55%, and 67% of patients with deep myometrial invasion, Grade 3 disease, and cervical involvement, respectively. Thirty-one high-risk patients (67%) received adjuvant RT. At a median follow-up of 33.5 months, 19 patients had relapsed, for a 5-year actuarial disease-free survival rate of 67.7%. Ten patients (12%) had recurrence in the pelvis, 9 of whom had been patients treated with surgery alone. The 5-year pelvic recurrence-free survival rate of patients treated with and without RT was 97% and 73.1%, respectively ( p = 0.02). The corresponding rates in the high-risk patients were 97% and 47% ( p = 0.0001). High-risk patients treated with RT also had better 5-year actuarial disease-free survival ( p = 0.0001) and cause-specific survival ( p = 0.003) than those treated with surgery alone. RT was well tolerated, with all patients receiving their treatment as planned. Only 1 patient developed significant late toxicity. Conclusions Adverse features are common in pathologic Stage I-II elderly endometrial carcinoma patients, and pelvic recurrence is high after surgery alone. Given the improvement in outcome and low incidence of toxicity, our results support the use of adjuvant RT in elderly pathologic Stage I-II patients with high-risk disease.