Eligible patients will receive 3 months of chemotherapy consisting of either FOLFOX or FOLFIRI (in the case of liver limited CRC) or FOLFOX (in the case of rectal cancer). The FOLFOX regimen consists of Oxaliplatin, Leucovorin, and 5-FU. The FOLFIRI regimen consists of Irinotecan, Leucovorin, and 5-FU. Zaltrap will be administered with chemotherapy every 2 weeks for the first 5 out of 6 planned treatment cycles. After a standard 3-4 week recovery period (i.e. 5-6 week's from the last Zaltrap dose), patients will undergo standard resection. At the time of resection, the tumor will be collected for biomarker discovery.