Researchers estimated Wednesday that mammograms caused more than 1 million American women over the past three decades to be diagnosed with early-stage breast cancers that would not have proved fatal if left undetected and untreated -- a controversial finding sure to provoke more heated debate over the benefits of the screenings. The study concluded that these women were “overdiagnosed” and “overtreated” because there was not a corresponding decline in the diagnosis of tough-to-cure breast cancers that have already spread.
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