Impact of adjuvant chemotherapy and pelvic radiation on pattern of recurrence and outcome in stage I non-invasive uterine papillary serous carcinoma. A multi-institution study.

OBJECTIVES: To determine the impact of adjuvant chemotherapy or pelvic radiation on risk of recurrence and outcome in stage IA non-invasive uterine papillary serous carcinoma (UPSC). METHODS: This is a multi-institutional retrospective study for 115 patients with stage IA non-invasive UPSC (confined to endometrium) treated between 2000 and 2012. Kaplan-Meier and multivariable Cox proportional hazards regression modeling were used. RESULTS: Staging lymphadenectomy and omentectomy were performed in 84% and 57% respectively. Recurrence was seen in 26% (30/115). Sites of recurrences were vaginal in 7.8% (9/115), pelvic in 3.5% (4/115) and extra-pelvic in 14.7% (17/115). Adjuvant chemotherapy did not impact risk of recurrence (25.5% vs. 26.9%, p=0.85) even in subset of patients who underwent lymphadenectomy (20% vs. 23.5%, p=0.80). These findings were consistent for pattern of recurrence. Among those who underwent lymphadenectomy, adjuvant chemotherapy did not impact progression-free survival (p=0.34) and overall survival (p=0.12). However among patients who did not have lymphadenectomy, adjuvant chemotherapy or pelvic radiation was associated with longer progression-free survival (p=0.04) and overall survival (p=0.025). In multivariable analysis, only staging lymphadenectomy was associated with improved progression-free survival (HR 0.34, 95% CI 0.12-0.95, p=0.04) and overall survival (HR 0.35, 95% CI 0.12-1.0, p=0.05). Neither adjuvant chemotherapy nor pelvic radiation were predictors of progression-free or overall survivals. CONCLUSION: In stage IA non-invasive UPSC, staging lymphadenectomy was significantly associated with recurrence and outcome and therefore, should be performed in all patients. Adjuvant chemotherapy or pelvic radiation had no impact on outcome in surgically staged patients but was associated with improved outcome in unstaged patients.

Adjuvant vaginal brachytherapy decreases the risk of vaginal recurrence in patients with stage I non-invasive uterine papillary serous carcinoma. A multi-institutional study.

OBJECTIVES: To investigate the impact of adjuvant vaginal brachytherapy on vaginal recurrence in stage I non-invasive uterine papillary serous carcinoma (UPSC). METHODS: This is a retrospective multi-institutional study from 2000-2012. 103 patients who underwent surgical treatment with non-invasive stage IA UPSC were included. RESULTS: 85% and 55% underwent staging lymphadenectomy and omentectomy respectively. 28.2% (29/103) developed recurrence. Vaginal, pelvic and extra-pelvic recurrences developed in 7.8% (8/103), 3.9% (4/103) and 16.5% (17/103) respectively. Among patients who were observed or received only chemotherapy, the rate of vaginal recurrence was 10.9% (7/64) compared to 2.6% (1/39) among those who received vaginal brachytherapy +/- chemotherapy (p=0.035). The rate of vaginal recurrence was not different between those who were observed and those who received only chemotherapy (9.3% vs. 14.3%, p=0.27). The 5-year progression free survival (PFS) and overall survival (OS) for the entire cohort were 88.3% and 90.6%. Patients who underwent surgical staging had longer PFS (p=0.001) and OS (p=0.0005) compared to those who did not. In multivariable analysis controlling for age, histology, chemotherapy, brachytherapy, and staging lymphadenectomy, only lymphadenectomy was an independent predictor of PFS (HR 0.28, 95% CI 0.11-0.71, p=0.0037) and OS (HR 0.27, 95% CI 0.10-0.71, p=0.0035). Neither chemotherapy nor brachytherapy were predictors of PFS or OS. CONCLUSIONS: This is the largest study reported in stage I non-invasive UPSC. The majority of recurrences were extra-pelvic. Vaginal brachytherapy has a significant role in reducing the risk of vaginal recurrence and surgical staging was the only predictor of outcome. Therefore, both should be considered in these patients.