Intensive program for colon cancer: Office visit, CBC, CEA+CA 19.9 at 4,8,12,16,20,24,30,36,42,48, and 60 months. Colonoscopy at 12, 24, 36, 48,and 60 months. Liver echography* at 4,8,12,16,24,36,48, and 60 months. Chest X-ray at 12,24,36,48,and 60 months.