Adjuvant carboplatin and paclitaxel with "sandwich" method radiotherapy for stage III or IV endometrial cancer: long-term follow-up at a single-institution.

OBJECTIVE:To evaluate disease-free survival (DFS) and overall survival (OS) associated with adjuvant carboplatin and paclitaxel chemotherapy interposed with radiation for advanced endometrial cancer. METHODS:This is a cohort study of adult women with stage III or IV endometrial cancer treated at a single institution, between April 2002 and October 2017. Tumor and treatment characteristics were recorded. Treatment consisted of 4 cycles of intravenous paclitaxel and carboplatin every 3 weeks, followed by external beam radiotherapy to the pelvis (45-50 Gy), and another 2 cycles of chemotherapy. One cohort of patients were prospectively enrolled from 2002 through 2006 and an additional cohort from 2007 to 2017, which was retrospectively analyzed. Primary endpoints for this study were DFS and OS rates which were calculated using Cox regression models. RESULTS:Eighty-two patients with a median age of 66.5 years (range, 35-83 years) were included. Median follow-up was 46 months (range, 9-196 months). Most patients had stage IIIC disease (62.2%) and serous carcinoma histology (46.3%). Median OS was 146 months and median DFS was 71 months. A 5-year OS and DFS were 64.9% and 55.7%, respectively. Age >60 years subgroup was at a significantly higher risk of DFS event or death. Histological subtype, location of positive nodes, and cancer stage (IIIa vs. higher stage) did not correlate to a higher risk of recurrence or death. CONCLUSION:Long term follow-up and a larger population confirm that the chemoradiotherapy sandwich method yields favorable outcomes in patients with high-risk endometrial cancer.