Video - National News
Posted on February 12, 2014 at 4:34 PM
Updated Wednesday, Feb 12 at 9:24 PM
A Canadian study that many experts say has major flaws has revived debate about the value of mammograms. The research suggests that these screening X-rays do not lower the risk of dying of breast cancer while finding many tumors that do not need treatment.
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Credit: WCVB via CNN