Colorectal cancer is malignant tumor that occurs in the colon or the rectum. In most people, colorectal cancer develops slowly over several years. It starts as a growth of tissue in the thinner lining of the
colon or rectum. This growth is called a polyp. Most polyps are benign, non-cancerous tumors. However, some polyps can change slowly over a period of 10 – 15 years to become cancer. Colorectal
cancer may also develop from abnormal cells in the lining of the colon or rectum. These abnormal cells are called dysplasia. These are not polyps but groups of cells that are not normal.
This type of colorectal cancer is more common in people with diseases of the bowel.
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