Sixty patients with locally advanced rectal cancer (cT3-4N0M0, cT1-4N1-2M0, ≤12cm from anus) will be enrolled and receive preoperative IMRT concurrent with high-dose intravenous vitamin C and 2-3 cycles of mFOLFOX6 chemotherapy, and then after 4 weeks rest, they will continue to complete 3 cycles of preoperative chemotherapy (mFOLFOX6). Radical surgery will be performed at 10-12 weeks after IMRT.~In this study, we will evaluate the safety and effectiveness of the treatment method through the acute toxicity [during CRT (concurrent chemoradiotherapy )], PCR (pathologic complete response) rate, sphincter preserving surgery rate, 2-year survival rate and 2-year disease-free survival rate.
The purpose of this study is to evaluate the safety and efficacy of preoperative chemoradiotherapy (IMRT) with concurrent high-dose intravenous vitamin C and mFOLFOX6 in locally advanced rectal cancer patients.