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Study disputes value of routine mammograms

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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.

The study gives longer follow-up on nearly 90,000 women who had annual breast exams by a nurse to check for lumps plus a mammogram, or the nurse’s breast exam alone. After more than two decades, breast cancer death rates were similar in the two groups, suggesting little benefit from mammograms.

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