Colorectal Cancer Overview

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Treating Colon/Rectum Cancer TOPICS

Surgery for colorectal cancer

Surgery is the main treatment for early colorectal cancer. Often, the piece of the colon or rectum with the tumor is removed and the ends are sewn back together. Surgeries using this method go by different names, such as colectomy, segmental resection, low anterior resection, and proctectomy with colo-anal anastomosis.

Sometimes, especially with rectal cancer, there isn’t enough tissue left on one side to sew the ends back together. In that case, one end is attached to the wall of the belly so that stool can empty into a bag outside the body. This is called a colostomy. An abdominoperineal (AP) resection is a surgery for rectal cancer where one end comes out to form a colostomy.

Sometimes, if there is a problem like the cancer growing through the wall of the colon or rectum, a colostomy is needed at first. Sometimes instead of the end of the colon forming a colostomy, the end of the small intestine must be used. This is called an ileostomy. Then later, after the belly has a chance to heal, the ends of the colon can be reconnected again.

If the rectal cancer is growing into nearby organs, a surgery called a pelvic exenteration is needed. In this operation the rectum as well as affected nearby organs such as the bladder, prostate, or uterus are removed. A colostomy is needed after this operation. If the bladder is removed, a urostomy (an opening to collect urine) is also needed.

Some colorectal cancers are just in the end of a polyp. These cancers are treated by just removing the polyp completely (often during colonoscopy). If there may be cancer left behind (like in the stalk of the polyp), you may need surgery to remove part of the colon or rectum. The doctor bases this on looking at the polyp under the microscope.

If you have a colostomy or ileostomy, you’ll need help in learning how to manage it. Nurses with special training will show you how to do this. To learn more, please see Colostomy: A Guide or Ileostomy: A Guide.

Side effects of colorectal surgery

Side effects of surgery depend on several factors like the extent of the operation and a person's general health before surgery. Common side effects are pain and nausea. You won’t be able to eat for a few days.

Other less common problems may include serious bleeding, damage to nearby organs, and infection.

Surgery for colorectal cancer that has spread

For cancer that has spread to other organs, sometimes surgery can help you live longer or, depending on the extent of the disease, may even cure you. If the colorectal cancer has spread to a few areas in the liver or lungs but not anywhere else, the cancer can sometimes be removed by surgery.

For cancer spread to the liver, methods other than surgery can be used to destroy the cancer. These include things like blocking the blood supply to the tumor or destroying the cancer by freezing it or killing it with high-energy radio waves. These methods are less likely to cure the cancer.

Since these cancers can often be hard to treat, you may also want to talk with your doctor about clinical trials of newer treatments that might be right for you.

For more information about surgery for colorectal cancer, please see our document Colorectal Cancer.


Last Medical Review: 10/15/2014
Last Revised: 10/24/2014