Purpose: Factors affecting outcome in patients with surgicopathologic Stage II endometrial cancer are poorly defined. The purpose of this study was to determine prognostic factors in a series of patients treated according to standardized protocols at a single institution.
Methods and materials: One hundred and seventy patients referred to Princess Margaret Hospital after hysterectomy between 1984 and 1995 were retrospectively reviewed. One hundred and twenty patients received postoperative external beam radiotherapy and brachytherapy, 18 received external beam radiotherapy alone, five received brachytherapy alone, and 27 had no radiotherapy.
Results: With a median follow-up of 5.1 years, overall and disease-free survival (DFS) at 5 years was 77% and 68%, respectively, and 24% of patients had relapsed. Significant independent adverse factors for DFS included age >65 (p = 0.0001), FIGO Stage IIB (p = 0.02), and capillary-lymphatic space (CLS) involvement (p = 0.0007). Prognostic factors for relapse were age (p = 0.0008), histologic grade (p = 0.01), and CLS (p = 0.01). A prognostic model based on the number of adverse prognostic factors (0-3) revealed that the 5-year survival rates for the four groups were as follows: 0%-85%, 1%-77%, 2%-55%, and 3%-11%. Combining the groups with 0 or 1 adverse factors resulted in a three-group variable that was strongly related to DFS (p < 0.0001).
Conclusions: Patient age, stage, and CLS were significant factors for DFS, and age, grade, and CLS predicted time to relapse in Stage II endometrial cancer. A prognostic model for DFS using these factors can provide clinically meaningful outcome predictions.