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    Colorectal Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] - Colorectal Cancer Prevention

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    Combination hormone replacement therapy

    Studies have shown that combination hormone replacement therapy (HRT) that includes both estrogen and progestin lowers the risk of invasive colorectal cancer in postmenopausal women. However, combination HRT does not lower the risk of dying from colorectal cancer.

    Not all hormone replacement therapy decreases the risk of having colorectal cancer. HRT with estrogen alone does not lower the risk of having invasive colorectal cancer or the risk of dying from colorectal cancer.

    The possible harms of hormone replacement therapy include an increased risk of having:

    Polyp removal

    Most colorectal polyps are adenomas, which may develop into cancer. Removing colorectal polyps that are larger than 1 centimeter (cm) may lower the risk of colorectal cancer. It is not known if removing smaller polyps lowers the risk of colorectal cancer.

    The possible harms of polyp removal during colonoscopy or sigmoidoscopy include a tear in the wall of the colon and bleeding.

    cdr0000415500.jpg
    Polyps in the colon. Some polyps have a stalk and others do not. Inset shows a photo of a polyp with a stalk.

    The effect of the following factors on the risk of colorectal cancer is not known:

    Nonsteroidal anti-inflammatory drugs (NSAIDs) other than aspirin

    It is not known if the use of nonsteroidal anti-inflammatory drugs or NSAIDs (such as celecoxib, naproxen, and ibuprofen) lowers the risk of colorectal cancer.

    Studies have shown that taking the nonsteroidal anti-inflammatory drug celecoxib reduces the risk of colorectal adenomas (benign tumors) coming back after they have been removed. It is not clear if this results in a lower risk of cancerous tumors in the colon and rectum. Taking celecoxib also has been shown to reduce the number of polyps that form in the colon and rectum of patients with familial adenomatous polyposis (FAP).

    The possible harms of NSAIDs include:

    Diet

    It is not known if a diet low in fat and meat and high in fiber, fruits, and vegetables lowers the risk of colorectal cancer.

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