If you are found to be eligible to take part in this study, you will be assigned to a study "arm" (group) based on the results of your screening tests. All patients will receive oxaliplatin and bevacizumab. If your doctor thinks it is in your best interest, you will also receive cetuximab. However, recent studies have found that cetuximab, when given alone or in combination with other chemotherapy drugs, was not effective when given to patients with colorectal cancer that had a K-RAS mutation. If you have colorectal cancer and you are tested for and do not have the K-RAS gene, you will also receive cetuximab. Patients with normal liver function will also receive 5-FU.