There are two phases of study treatment. The first phase is for all patients and will last about 6 weeks. During this phase, oxaliplatin will be given intravenously once a week during weeks 1, 2, 4, and 5 on days 1, 8, 22, and 29; bevacizumab will be given intravenously once every 2 weeks during weeks 1, 3, and 5 on days 1, 15, and 29; capecitabine will be administered orally for 14 consecutive days (days 1-14), then a week of no capecitabine, followed by another 14 days of capecitabine (days 22-35).