Trial of Celecoxib With Preoperative Chemo- Radiation for Locally Advanced Rectal Cancer

This is a single arm phase II trial with combined celecoxib, tegafur-uracil, folinate and preoperative radiotherapy for patients with locally advanced rectal cancer. The primary end point is pathological complete response (pCR) rate. The secondary endpoints are toxicities of combined celecoxib and chemoradiation, negative resection margin rate, clinical tumor response by magnetic resonance imaging (MRI), sphincter preservation rate, disease-free survival and overall survival.