For every 1,000 women in the US who are 50-years-old getting mammograms every two years, only one fewer breast cancer death will occur over 10 years, reducing the number who die from breast cancer from 5 women to 4 women, but there is no evidence that the total number of deaths is reduced because the radiation from mammograms and unnecessary treatment may cause one additional death from other causes, and out of every 1,000 women given mammograms, “490 to 670 women are likely to have a false positive mammogram with repeat examination; 70 to 100 [are likely to have] an unnecessary biopsy; and 3 to 14 [are likely to have] an overdiagnosed breast cancer that would never have become clinically apparent [and would never have caused them any problems],” according to a recent article by two Swiss researchers published in the New England Journal of Medicine.
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