The proposed clinical trial will be a multi-center, randomized, open label, active control study in previously untreated patients with metastatic colorectal cancer aimed to evaluate the safety, tolerability and efficacy of the monoclonal antibody, CT-011, administered at 3mg/kg in combination with FOLFOX chemotherapy (FOLFOX4 or mFOLFOX6) compared with treatment by FOLFOX alone. Approximately 168 patients are planned to be enrolled to this study.