About This Condition
Colon cancer is a malignancy in the colon. It is characterized by unregulated replication of cells creating tumors, with the possibility of some of the cells spreading to other sites (metastasis).
This article includes a discussion of studies that have assessed whether certain vitamins, minerals, herbs, or other dietary ingredients offered in dietary or herbal supplements may be beneficial in connection with the reduction of risk of developing colon cancer.
This information is provided solely to aid consumers in discussing supplements with their healthcare providers. It is not advised, nor is this information intended to advocate, promote, or encourage self prescription of these supplements for cancer risk reduction or treatment. Furthermore, none of this information should be misconstrued to suggest that dietary or herbal supplements can or should be used in place of conventional anticancer approaches or treatments.
It should be noted that certain studies referenced below, indicating the potential usefulness of a particular dietary ingredient or dietary or herbal supplement in connection with the reduction of risk of colon cancer, are preliminary evidence only. Some studies suggest an association between high blood or dietary levels of a particular dietary ingredient with a reduced risk of developing colon cancer. Even if such an association were established, this does not mean that dietary supplements containing large amounts of the dietary ingredient will necessarily have a cancer risk reduction effect.
In Western countries, cancers of the colon and rectum account for more new cancer cases each year than any other site except the lung. Although the genetic susceptibility is low, some families have a predisposition for colon cancer that usually occurs before age 40. Ulcerative colitis and Crohn’s disease as well as familial polyposis, are disorders that, to varying degrees, increase the risk of colon cancer.
The initial symptoms of colon cancer depend on the location of the tumor. Cancer in the portion of the colon nearest the left side of the body and areas close to the rectum are the most common cause for a change in bowel habits and consistency of the stool. Cancer in this part of the colon may also cause a colicky pain that is made worse by eating. Blood mixed with the stool and bowel obstruction are other symptoms that characterize cancer at this site. Ineffectual and painful straining at stool may be a sign that the cancer is more advanced. Cancer localized to the part of the colon nearest the right side of the body may cause a generalized abdominal pain and brick red blood. It is commonly associated with iron-deficiency anemia, especially when no other cause can be identified. Cancers closer to the rectum often cause a steady gnawing pain and bright red blood coating the stool.
The primary treatment for cancer of the colon is surgical removal of the cancer. The procedure will depend upon the location and invasiveness of the tumor. Radiation is sometimes used with surgery and chemotherapy, particularly for rectal cancer.