Letters Mammography screening

Study “guesstimated” how many cancers would have occurred without mammography screening

BMJ 2014; 349 doi: https://doi.org/10.1136/bmj.g6824 (Published 25 November 2014) Cite this as: BMJ 2014;349:g6824
  1. Daniel B Kopans, senior radiologist1
  1. 1Breast Imaging Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
  1. dkopans{at}partners.org

De Glas and colleagues’ conclusions are incorrect, having adopted the faulty method used by Bleyer and Welch.1 2 All authors incorrectly claimed massive overdiagnosis of breast cancer and failure to reduce the rate of advanced cancers.3 4

Both papers rely on “guesstimating” how many cancers would have occurred without screening and falsely claim that the excess beyond their guesses would …

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