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Chicago Tribune -- Screening tests like mammograms and self-exams are most adept at finding the indolent cancers, Welch says. As a result, the more we screen, the more women we subject to surgery, chemotherapy and radiation for cancers that never would have harmed them. A paper published last month in the New England Journal of Medicine estimated that for every life saved by a screening mammogram, five to 15 other women needlessly became diagnosed and treated.