 - Erlotinib, modified FOLFOX6, and bevacizumab chemotherapy: Patients receive oral erlotinib once daily on days 1-14, oxaliplatin IV over 2 hours and leucovorin calcium IV over 2 hours on day 1, and fluorouracil IV continuously over 46 hours on days 1 and 2 in course 2. Beginning in course 3, patients also receive bevacizumab IV over 30 minutes. Courses repeat every 14 days in the absence of disease progression or unacceptable toxicity. 