In this trial, we will compare the efficacy, safety, and tolerability of this novel combination of biweekly infusional 5-FU/leucovorin plus cetuximab and bevacizumab (FOLF-CB) to the current standard of care, biweekly infusional 5-FU/leucovorin plus oxaliplatin and bevacizumab (Bev-FOLFOX). For practical purposes, this study will be a head to head comparison of oxaliplatin versus cetuximab, since the other components of both regimens will be the same.