Maintenance Chemotherapy With S-1, Locally Advanced Esophageal Cancer Receiving Definitive CCRT

Phase II study of definitive concurrent chemoradiotherapy follows consolidative chemotherapy with S1 for locally advanced unresectable esophageal cancer. Our treatment strategy is to perform maintenance chemotherapy with S-1 in patients with locally advanced esophageal cancer receiving dCCRT. The aim of this study is to evaluate the efficacy and side effects of patients with locally advanced unresectable esophageal cancer after dCCRT with platinum-based chemotherapy follow maintenance therapy with S-1. The primary endpoint is overall survival (OS) rates at 24 months, defined as the proportion of patients who have not experienced death from any cause at months. With a sample size of 60 patients, the study had a power of 80%, assuming 2-year OS of 45% in the experimental arm and 30% in the historical control, with a one-sided significance level of 5%.