Chemotherapy w/wo WeiLeShu in Metastatic Colorectal Cancer

Inclusion Criteria: * At least 18 years of age, of any race or sex who are eligible to sign written consent and have undergone prior resection of histological evidence of colorectal cancer * Hematologic function: ANC ≥ 1.5 x 10 /L, platelets ≥ 75 x 10 /L, and hemoglobin \> 9 g/dL Adequate liver function as measured by: total bilirubin ≤ 2.0 mg/dl, AST and ALT ≤ 5 ULN, albumin ≥ 2.5 g/dl Adequate renal function as measured by: creatinine ≤ 2.9 mg/dl, \> 50 ml/min calculated by the C-G equation Non-pregnant women of childbearing potential and fertile men are required to use effective contraception (negative pregnancy test for women of child-bearing age) ECOG status ≤ 1 at screening Exclusion Criteria: \-