Hormone therapy increases frequency of abnormal mammograms, breas... ( Combined hormone therapy appears to ...)

Hormone therapy increases frequency of abnormal mammograms, breast biopsies

Date:2/25/2008

Combined hormone therapy appears to increase the risk that women will have abnormal mammograms and breast biopsies and may decrease the effectiveness of both methods for detecting breast cancer, according to a report in the February 25 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

Hormone therapy use remains common among women beginning menopause, according to background information in the article. For women with a uterus considering combined estrogen plus progestin use, identified breast cancer issues represent a concern, the authors write.

Rowan T. Chlebowski, M.D., Ph.D., of the Los Angeles Biomedical Research Institute at HarborUCLA Medical Center, and colleagues studied 16,608 post-menopausal women who participated in the Womens Health Initiative (WHI) clinical trial, beginning in 1993 through 1998. A total of 8,506 women were randomly assigned to receive a combination of estrogen (0.625 milligrams of conjugated equine estrogens per day) plus progesterone (2.5 milligrams of medroxyprogesterone acetate per day), while 8,102 took a placebo. Each woman received a mammogram and breast examination yearly, with biopsies performed based on physicians clinical judgment.

During the 5.6 years of the study, 199 women in the combined hormone group and 150 women in the placebo group developed breast cancer. Mammograms with abnormal results were more common among women taking hormones than among women taking placebo (35 percent vs. 23 percent); women taking hormones had a 4 percent greater risk of having a mammogram with abnormalities after one year and an 11 percent greater risk after five years.

Breast biopsies also were more common among women taking hormones than among those assigned to placebo (10 percent vs. 6.1 percent). Although breast cancers were significantly increased and were diagnosed at higher stages in the combined hormone group, biopsies in that group less frequently diagnosed cancer (1
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Contact: Laura Mecoy
310-546-5860
JAMA and Archives Journals
Source:Eurekalert

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