This adaptive seamless Phase II/III trial is to compare the efficacy and safety of adjuvant systemic chemotherapy (SCT) with or without hepatic arterial infusion (HAI) after complete hepatic resection for Chinese patients with metastatic colorectal cancer.

Diagnosis Criteria:

All patients should have histologically confirmed colorectal adenocarcinoma with hepatic metastases and primary tumours completely resected during the operation and with colorectal metastatic to the liver confirmed pathologically after the operation as well as with negative surgical margin.

Main criteria for inclusion:

• Aged 18-75 years
• Diagnosed as colorectal adenocarcinoma which only spread to the liver and with no extra-hepatic metastases
• Prior curative resection of primary tumours (R0 resection) or concurrent feasible curative resection of primary tumours and hepatic metastases (R0 resection is met)
• Performance status ECOG 0-1
• No serious complication occurred during or after metastases resection and affected subsequent treatment.
• Hematology: White blood count ≧ 4.0X10^9/L, Absolute neutrophil count ≧1.5X10^9/L, Platelet count ≧ 100 X10^9/L, Hemoglobin ≧ 100g/L
• Blood biochemistry: Total bilirubin ≦2mg/dL , Direct bilirubin equal or less than 1.5 times upper limit of normal (ULN), Alanine aminotransferase (ALT) no greater than 2.5 times ULN, Aspartate aminotransferase (AST) no greater than 2.5 times ULN, Serum creatinine no greater than ULN, or glomerular filtration rate equal or greater than 60 mL/min/1.73m^2
• Not pregnant or nursing at present
• Fertile patients must use effective contraception
• Able to withstand major operative procedure
• No prior or concurrent malignancy within the past 5 years except basal cell or squamous cell skin cancer or carcinoma in situ of any organ
• No prior hepatic artery infusion therapy with 5-FU or floxuridine
• No prior systemic chemotherapy for metastatic disease
• No other concurrent chemotherapy
• Able to understand and sign off informed consent form