Routine visits would include COLON:14 visits with cea and 6 CTs over a 5 year period plus PET/CT at last visit RECTAL: 14 visits with cea and 6 CTs and 4 procto exams over 5 year period plus PET/CT at last visit HEAD/NECK: 14 visits with 4 CTs and PET/CT at last visit LUNG:12 visits plus 4 CTs and PET/CT at last visit