A Study of Total Neoadjuvant Therapy for High-risk Locally Advanced Rectal Cancer

"Radiotherapy:~50Gy in 25 fractions to the primary tumor and to mesorectal, presacral,and internal iliac lymph nodes.~Concurrent chemotherapy:~Capecitabine 1650 mg/m2/d"

"Intravenous infusion of oxaliplatin (130 mg/m2 over 2 h) on day 1 and oral administration of capecitabine (1000 mg/m2 twice daily) from day 1 to day 14, is repeated every 3 weeks for 6 cycles.~6 courses，3 weeks per course"

Administration of l-LV (400 mg/m2) and oxaliplatin (85 mg/ m2) by intravenous infusion over 2 h, followed by rapid intravenous infusion (iv) of 5-FU (400 mg/m2) and then slow infusion (civ) of 5-FU (2400 mg/m2 over 46 h), is repeated every 2 weeks for 9 cycles.

Total mesorectal excision