It is a single-arm phase II trial. The target population is patients with histologically diagnosed locally advanced ESCC patients (clinically staged at least T3 and/or any N and M0 by endoscopic ultrasonography [EUS] and fludeoxyglucose-positron emission tomography [FDG-PET]) who have received preoperative cisplatin-based chemoradiotherapy (CRT) followed by surgery, and exhibit high risk (closed or involved resection margin or extranodal invasion of involved lymph nodes or ypN2-3) of tumor recurrence. Eligible patients will receive adjuvant cisplatin-based CRT followed by pembrolizumab for 18 cycles.The study will enroll 46 patients in Taiwan. The estimated enrollment period is 2 years.
In this study, participants with histologically diagnosed locally advanced esophageal squamous cell carcinoma who have received preoperative cisplatin-based chemoradiotherapy followed by surgery harbouring high risk of tumor recurrence will receive adjuvant cisplatin-based chemoradiotherapy followed by pembrolizumab. The primary study hypothesis is that adjuvant pembrolizumab will improve the 1-year recurrence-free survival rate compared to historical control.