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1 May 1998 | Volume 128 Issue 9 | Pages 705-712
Background: Accumulating evidence suggests that postmenopausal hormone use may decrease the risk for colorectal cancer.
Objective: To examine the relation of postmenopausal hormone therapy to colorectal adenoma and cancer.
Design: Prospective cohort and nested case–control studies.
Setting: Nurses' Health Study, a study of registered nurses recruited from 11 U.S. states.
Participants: 59 002 postmenopausal participants in the Nurses' Health Study.
Measurements: Self-reported data on hormone use and cases of distal colorectal adenoma and colorectal cancer obtained from biennial questionnaires completed from 1980 to 1994. Cases of colorectal adenoma and cancer were confirmed by medical record review.
Results: 470 women developed colorectal cancer, and 838 developed distal colorectal adenomas. Current use of postmenopausal hormones was associated with a decreased risk for colorectal cancer (relative risk [RR], 0.65 [95% CI, 0.50 to 0.83]). This association was attenuated in past users (RR, 0.84 [CI, 0.67 to 1.05]) and disappeared 5 years after hormone use was discontinued (RR, 0.92 [CI, 0.70 to 1.21]). Longer duration of current use did not afford greater protection (RR with
Conclusions: The risk for colorectal cancer was decreased among women currently receiving postmenopausal hormone therapy, but the apparent reduction substantially diminished upon cessation of therapy. Hormone use was inversely associated with large colorectal adenomas but not small ones.
Author and Article Information
From Brigham and Women's Hospital, Harvard Medical School, and Harvard School of Public Health, Boston, Massachusetts.
ARTICLE
Postmenopausal Hormone Use and Risk for Colorectal Cancer and Adenoma
5 years of use, 0.72 [CI, 0.53 to 0.96]). Even after exclusion of women who reported having screening sigmoidoscopy, the relative risk for colorectal cancer seen with current hormone use was 0.64 (CI, 0.49 to 0.82). This suggests that the apparent protection is unlikely to be due to more intensive screening among hormone users. Current users also had a lower risk for large ( 1 cm) adenomas than did women who had never used hormones (RR, 0.74 [CI, 0.55 to 0.99]), although no overall material association was seen between colorectal adenoma and current hormone use (RR, 0.91 [CI, 0.77 to 1.08]).
Grant Support: By research grant CA40356 from the National Institutes of Health. Dr. Grodstein is partially supported by grant AG13482 from the National Institute of Aging.
Requests for Reprints: Francine Grodstein, MD, Channing Laboratory, 181 Longwood Avenue, Boston, MA 02115.
Current Author Addresses: Drs. Grodstein, Colditz, Kautzky, and Stampfer: Channing Laboratory, 181 Longwood Avenue, Boston, MA 02115.
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