Surveillance of patients at high risk for colorectal cancer.

Colorectal cancer (CRC) mortality may be greatly reduced by clinically feasible screening programs. The benefits of surveillance of high-risk programs are evident. Cancer mortality can be dramatically reduced by eradication of precursor lesions and by detection of cancer at an early and highly curable stage. Available screening methods, recommended intervals, and screening for other associated cancers are reviewed for specific high-risk groups.