A Canadian study reported in the British Medical Journal questions the benefit of widespread mammography, suggesting the practice doesn't reduce breast cancer deaths yet leads to unnecessary treatment. The report has sparked discussion and some controversy, with some doctors citing data showing a clear benefit from screening. Breast imaging specialist Dr. Markus Holzhauer notes that all major U.S. breast specialist organizations endorse regular mammograms for women ages 40 and older. Dr. Richard C. Wender of the American Cancer Society said his group has convened a panel of experts who will review the data as part of a guideline revision expected to be finished later this year.
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