1. Stage 4 colon cancer either s/p metastasectomy or post-initial chemotherapy or maintenance "standard of care", either involving 5-fluorouracil/leucovorin (5-FU/LV) alone or continual bevacizumab alone. Patients in maintenance cohort must have had 2 consecutive CT scans showing stable disease and not be experiencing significant prior treatment-related toxicity above Grade 1.