National Cancer Institute at the National Institutes of Health
Cancer: What You Need to Know Cancer of the Colon
This resource provides a detailed description of cancer of the colon and rectum. Includes information on diagnosis, symptoms, stages and treatment of this cancer. Also provides links to definitions of many of the terms used throughout...
CK-12 Foundation
Ck 12: Biology: Carcinogens and Cancer
[Free Registration/Login may be required to access all resource tools.] An overview of cancer and its causes.