PURPOSE: To determine the outcome of patients after radical radiotherapy (RT) for isolated vaginal recurrence of endometrial carcinoma and to determine the clinical and pathologic predictors of outcome. METHODS AND MATERIALS: We reviewed the records of 91 patients treated at our institution between 1960 and 1997 with radical RT for vaginal recurrence after definitive surgery for endometrial carcinoma. Thirty-one percent of the patients received external beam RT (EBRT) alone, 12% received brachytherapy alone, and 57% received a combination. The median dose of radiation was 75 Gy (range 34-122). All end points were measured from the time of the first recurrence. The median duration of follow-up after recurrence was 58 months (range 1-289). RESULTS: The 2- and 5-year local control (LC) rate and overall survival rate was 82% and 75% and 69% and 43%, respectively. The median time from initial diagnosis of endometrial cancer to death from disease was 38 months. On univariate analysis, a dose to the relapse site of > or =80 Gy and EBRT plus brachytherapy vs. single-modality therapy were significant predictors of improved LC. On multivariate analysis, only the type of treatment correlated significantly with LC (p = 0.03). On univariate analysis, Grade 1 or 2 vs. Grade 3 tumor and EBRT plus brachytherapy vs. single-modality therapy were significant predictors of improved overall survival. CONCLUSION: RT provides excellent LC of isolated vaginal recurrences of endometrial carcinoma, particularly when high doses are given using a combination of EBRT and brachytherapy. However, distant metastases frequently develop despite local disease control, contributing to a 5-year overall survival rate of <50%. For patients who have an isolated vaginal recurrence, the time from initial diagnosis of endometrial cancer to death from disease is usually >3 years. For this reason, in studies of adjuvant RT, long-term follow-up is required to permit evaluation of the impact of treatment on survival.