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Cancer Information Network: What You Need to Know About Cancer of the Colon
This site is an extensive evaluation of what colon cancer is, how it is treated, symptoms, etc.
Mayo Clinic
Mayo Clinic: Colon Cancer
This site from the MayoClinic.com provides great information on Colorectal cancer, which includes both cancer of the colon and the rectum. The article includes facts on signs and symptoms, causes, risk factors, treatment and prevention.