For almost a year, Daniel Szkarlat thought his intestinal pain was due to an ulcer. When the symptoms didn't go away, a colonoscopy found he had a large mass. His doctor removed the mass and 33 lymph nodes and said he wouldn't need chemotherapy or radiation treatment. Dan and his wife weren't so sure, so they got a second opinion from John Krauss, M.D., director of the Multidisciplinary Colorectal Cancer Clinic at the University of Michigan Rogel Cancer Center.