This study is designed to evaluate the efficacy and safety of adjuvant hyperthermic intraperitoneal chemotherapy (HIPEC) with raltitrexed or oxaliplatin versus no HIPEC in locally advanced colorectal cancer

Peritoneum is one of the common sites of metastasis in advanced stage colorectal cancer patients, resulting in a poor prognosis. Hyperthermic intraperitoneal chemotherapy (HIPEC) is effective to colorectal peritoneal metastasis and may play a significant role in reducing the risk of metachronous peritoneal metastasis among patients with locally advanced colorectal cancer. Oxaliplatin is routinely used for HIPEC in the Europe and Raltitrexed may be another ideal drug for HIPEC. The present phase II multicenter, randomized controlled trial is designed to evaluate the efficacy and safety of adjuvant HIPEC with raltitrexed or oxaliplatin versus no HIPEC in locally advanced colorectal cancer.

Inclusion Criteria:

• Joined the study voluntarily and signed informed consent form
• Eastern Cooperative Oncology Group performance status of 0 to 1
• Life expectancy of more than 5 years
• Colorectal adenocarcinoma / mucinous adenocarcinoma / signet ring cell cancer confirmed by histopathology
• Stage T4NanyM0 cancer; or stage T3NanyM0 mucinous adenocarcinoma / signet ring cell cancer / adenocarcinoma with partly mucinous adenocarcinoma or signet ring cell cancer
• R0 resection of colorectal cancer
• Neutrophils (ANC) ≥ 1.5×10^9/L, Platelet count (Pt) ≥ 100× 10^9/L, Hemoglobin (Hb) ≥ 80 g/L, Hepatic function: ALT and AST ≤ 2.5 times upper limit of normal (ULN) and TBIL ≤ 1.5 times ULN, Renal function: creatinine ≤ 1.5 times ULN
• Use of an effective contraceptive for adults to prevent pregnancy

Exclusion Criteria:

• Rectal cancer below peritoneal reflection (≤ 8cm above the anal verge)
• Other malignant tumors within the past 5 years, except for skin basal cell carcinoma, or cervical carcinoma in situ, who survived from radical treatment
• Severe adhesion of peritoneal cavity impossible to separate
• Abdominal infection
• Allergic to raltitrexed, 5-FU, and oxaliplatin; Dihydropyrimidine dehydrogenase (DPD) enzyme deficiency
• Uncontrolled seizures or psychiatric diseases, loss of control over their own behavior
• Drug addiction, Alcoholism or AIDS
• Impossible to tolerate the operation due to severe cardiac, lung, and vascular diseases
• Pregnant or breast-feeding women or people during the birth-period who refused to take contraceptives