Colon cancer iii stage treatment colon cancer develops in the large intestine when it is diagnosed the doctor will give it a stage which signifies how big the cancer is and how far it has progressed when classified as stage iii it means the cancer has spread beyond the inner tissue layers where it first formed and is now into other . If colon cancer develops many treatments are available to help control it including surgery radiation therapy and drug treatments such as chemotherapy targeted therapy and immunotherapy colon cancer is sometimes called colorectal cancer which is a term that combines colon cancer and rectal cancer which begins in the rectum. Get a better understanding about the staging system for colon cancer and learn what your cancer stage means for your health treatment and expectations. Colon cancer stages at its earliest stage stage 0 colon cancer is limited to the inner lining of your colon as colon cancer progresses it can grow through your colon and extend to nearby structures the most advanced stage of colon cancer stage iv indicates cancer has spread to other areas of the body such as the liver or lungs. Signs and symptoms of colon cancer tend not to be specific in other words the signs and symptoms can occur due to a number of different conditions when colon cancer is detected in its early stages it may not have even caused symptoms symptoms can also vary according to the specific location within the colon where the tumor is located some symptoms and signs of colon cancer are