The study evaluates the addition of Amifostine to capecitabine and irinotecan in neoadjuvant chemoradiation(CRT) in locally advanced rectal cancer. Half of participants will receive capecitabine and along with neoadjuvant radiotherapy, followed by a cycle of XELIRI, while the others will receive capecitabine and irinotecan added by amifostine during CRT, followed by a cycle of XELIRI. All participants will be scheduled to receive surgery 6-8 weeks after the completion of CRT. Then it will depends which regimens the patient would receive according to his or her pathological results.

Inclusion Criteria:

• pathological confirmed adenocarcinoma
• clinical stage T3-4 and/or N+
• the distance from anal verge less than 12 cm
• without distance metastases
• performance status score: 0~1
• UGT1A1*28 6/6 or 6/7
• without previous anti-cancer therapy
• sign the inform consent

Exclusion Criteria:

• pregnancy or breast-feeding women
• serious medical illness
• baseline blood and biochemical indicators do not meet the following criteria: neutrophils≥1.5×10^9/L, Hb≥90g/L, PLT≥100×10^9/L, ALT/AST ≤2.5 ULN, Cr≤ 1 ULN
• DPD deficiency
• UGT1A1*28 7/7