Colon cancer screening and the evaluation and follow-up of colonic polyps.

Approximately 150,000 new cases of colon cancer are diagnosed each year, and the mortality rate continues to be greater than 50% of those diagnosed. Screening for colon cancer should be part of the routine health maintenance program of the primary physician. Use of history, physical examination, and sigmoidoscopy is part of a complete program. Colonoscopic removal of polyps reduces cancer risk.