Colon cancer is the growth of cancer in the large intestine. The large intestine, or colon, absorbs water and nutrients from foods. After, the colon passes the solid waste to the rectum for storage, before it is eliminated from the body.
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Cancer occurs when cells in the body divide without control or order. Eventually these uncontrolled cells form a growth or tumor. The term cancer refers to malignant growths. These growths can invade nearby tissues and spread to other parts of the body. It is not clear exactly what causes these problems in the cells, but it is probably a combination of genetics and environment.
Being over 50 years old increases your chance of colon cancer. Other factors that may increase your chance of colon cancer include:
In most cases, there are no symptoms with colon cancer. When symptoms do appear, they may include:
You will be asked about your symptoms and medical history. A physical exam will be done. The doctor will check the rectum for lumps or abnormal areas, and recommend different tests in order to identify tumors and confirm diagnosis.
Tests used to identify potential colon cancers include:
Additional tests may confirm the presence of colon cancer, determine what stage the cancer is in, and/or determine if the cancer has spread:
The physical exam, combined with all of your test results, will help to determine the type and stage of cancer you have. Staging is used to guide your treatment plan. Like other cancers, colon cancer is staged from I-IV. Stage I is a very localized cancer, while stage IV indicates a spread to other parts of the body
Treatment for colon cancer depends on how early it is detected, and the stage or location of the tumor.
Talk with your doctor about the best treatment plan for you. Treatment may include one or more of the following options:
Surgery is the main treatment for colon cancer. There are several options for surgery depending on the location of the cancer and how much it has spread:
Some surgeries may require temporary or permanent colostomies. A colostomy is a surgical opening through the wall of the abdomen into the colon. This is used as a path for waste material to leave the body. After a colostomy, you will wear a special bag to collect bodily waste.
Radiation therapy is the use of radiation to kill cancer cells and shrink tumors. It is directed at the site of the tumor from a source outside the body. This therapy is aimed at the immediate area of the cancer.
Chemotherapy uses drugs to kill cancer cells. It may be given in many forms, including pill, injection, and catheter. The drugs enter the bloodstream and travel through the body killing mostly cancer cells. They can also kill some healthy cells. This therapy is systemic, meaning it affects your entire body.
Targeted therapy uses medications to target and kill cancer cells, while sparing healthy tissue. They are currently used to treat advanced cancers. Targeted therapy is less harmful to healthy tissue, which reduces side effects. It may be used alone or in combination with chemotherapy.
Some medications can be used as part of a treatment plan. Other medications may help to either prevent or reduce side effects of treatments, or to manage certain side effects once they occur. These include:
Tell your doctor when you notice a new symptom, and ask if any of these medications are appropriate for you.
The causes of most cancers are not known. However, it is possible to prevent many colon and rectal cancers by finding and removing polyps that could become cancerous. Beginning at age 50, both men and women with average risk should follow one of the following screening options:
People with any of the following risk factors should begin colon and rectal cancer screening earlier and/or undergo screening more often:
Be sure to discuss colon cancer screening with your doctor to see how and when you should be screened.
There are lifestyle changes that may reduce your risk of colon cancer, such as:
American Cancer Society
National Cancer Institute
Canadian Cancer Society
Colorectal Cancer Association of Canada
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Last reviewed September 2015 by Mohei Abouzied, MD Last Updated: 9/12/2014