Majority of colon cancer cases start as small and non-cancerous clumps of the cells known as adenomatous. After a certain period of time, these polyps become colon cancers. These are the third most commonly diagnosed cancers in world. They start as a small proliferated, ulcerated lesions or thickenings from the inner most layers of bowel lining. Left untreated they grow in size, extend through the wall to adjacent organs, involve nearby lymph nodes and at latter stages involve the liver and other distant organs, through blood stream, manifesting as different stages of disease progression.