What is colorectal cancer?
Colon cancer is 90% curable if caught early -- if caught late, it is 90% fatal. Colon cancer is the second leading cause of cancer death in North America. In 2009 the Canadian Cancer Society estimates that 22,000 Canadians will be diagnosed with colorectal cancer and 9,100 of us will die of it. Put another way, 1 in 14 men and 1 in 15 women will be diagnosed with colorectal cancer. Colonoscopy is the best test to prevent colon cancer.
How does colorectal cancer start?
Most cancers develop on the inner lining of the large bowel from gland-type polyps. You can think of polyps as flat lesions, like a pitcher's mound in baseball, or as pedunculated lesions like a mushroom. Some polyps are harmless and others grow to become cancerous. The pathway from normal mucosa, through a polyp stage to a cancer takes about ten years on average. Some cancers are more aggressive and grow more quickly; others more slowly. The photograph shows two polyps and a cancer.