Additional tests may be performed to help determine the stage. Treatment for colorectal cancer depends on a number of factors, including the general health of the patient and the size, location, and extent of the tumor. Many different treatments and combinations of treatments are used to treat colorectal cancer. Surgery to remove the cancer is the most common treatment for colorectal cancer. The type of surgery that a doctor performs depends mainly on where the cancer is found.
Chemotherapy is the use of anticancer drugs to kill cancer cells.
The anticancer drugs circulate in the bloodstream and affect cancer cells throughout the body. Radiation therapy , also called radiotherapy, involves the use of high-energy x rays to kill cancer cells. Radiation therapy affects the cancer cells only in the treated area. Biological therapy , also called immunotherapy , uses the body's immune system , either directly or indirectly, to fight cancer. The immune system recognizes cancer cells in the body and works to eliminate them.