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Commentaries question benefit of early breast cancer screening

A series of three commentaries in the October 15 issue of the Journal of the National Cancer Institute address the issue of whether premenopausal women are being accurately informed about the potential harms versus benefits of mammography before undergoing screening.

In the first commentary, Cornelia J. Baines, M.D., of the University of Toronto, notes that randomized trials of breast cancer screening have consistently found that for women ages 40 to 49, screened women have a higher rate of death from breast cancer than unscreened women for up to 11 years after screening starts--only then do benefits appear.

"Women are supposed to be informed before making decisions about screening, but unfortunately, most are ill-informed about both the hazards and the benefits of screening," Baines writes.

She offers possible biologic explanations for the higher mortality rates among younger women treated for breast cancer, such as the stimulation of dormant metastases after surgery and the low-energy x-rays used in screening mammography, which some believe are more likely to cause cancer than high-energy x-rays.

Baines says more concrete answers should be available after publication of results from a U.K. trial of mammography screening, which recruited women as they turned 40 years old.

In a counterpoint to the commentary, Alfred O. Berg, M.D., writing on behalf of the U.S. Preventive Services Task Force, points out that the evidence suggesting an early mortality increase is weak and its real importance is unknown.

Still, he cautions, screening in premenopausal women may have important harms, including false-positive results, unnecessary biopsies, and possible overdiagnosis and overtreatment of cases that might not have been clinically important.

"Thus, whether screening actually reduces survival for a very small number of younger women may or may not outweigh the value women place on the benefit of the modest
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Contact: Linda Wang
jncimedia@oupjournals.org
301-841-1287
Journal of the National Cancer Institute
14-Oct-2003


Page: 1 2

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