Colon cancer develops when a colon polyp is allowed to grow too long and change into cancer. The cells that line our colon (large intestine) are constantly being produced, utilized and then shed off and new ones grow back in their place. As this process happens there is a chance one of the cells may develop a defect that allows for uncontrolled cell growth. This uncontrolled growth can develop into a polyp and some of those polyps may continue to grow into a malignant cancer if not removed in time. The malignant cancer will then invade other healthy tissue in and around the colon and can lead to death.