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Colorectal Cancer Colorectal cancer is the third leading cause of cancer-related deaths in the United States when men and women are considered separately, and the second leading cause when both sexes are combined. It is expected to cause about 51,690 deaths during 2012. The death rate from colorectal cancer has been dropping in both men and women for more than 20 years due to improved screening techniques and treatment for colorectal cancer has improved over the last several years. As a result, there are now more than 1 million survivors of colorectal cancer in the United States. Colon and rectum cancers are sometimes referred to together as "colorectal cancer", usually grow in the lining of the large intestine. It is a disease in which normal cells in the lining of the colon or rectum begin to change, start to grow uncontrollably, and no longer die. These changes usually take years to develop; however, in some cases of hereditary disease, changes can occur within months to years (Ahnen, 2006). Both genetic and environmental factors can cause the changes. Initially, the cell growth appears as a benign polyp that can, over time, become a cancerous tumor. If not treated or removed, a polyp can become a potentially life-threatening cancer. Recognizing and removing precancerous polyps before they become cancer can prevent colorectal cancer. Over 95% of colorectal cancers are adenocarcinomas. These are cancers of the glandular cells that line the inside of the colon and rectum. Other, less common type of tumors may also develop in the colon and rectum. “Colorectal cancers are thought to develop slowly over a period of several years. Before a true cancer develops, there usually are precancerous changes in the lining of the colon or rectum” (Eng, 2006, p. 145). These changes might be dysplasia or adenomatous polyps. Some types of polyps are not

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