Radiation therapy is under updating.
Radiation therapy is used in addition to surgery for curative or palliative treatment for primary tumors local recurrence or metastases, especially for rectal cancer.
Adenocarcinomas in the colon and rectum possess average radiation sensitivity and require high doses for treatment. Normal tissue is the limiting radiation factor. The small intestine is one of the radiation limiting organs. For radiation in the lower pelvis, there is usually little bowel in the radiation field. The colon, on the other hand, is surrounded by the small intestine on more or less all sides with subsequent radiation damage after radiation treatment. Radiation treatment is therefore used to a very small extent for colon cancer.