Abstract
Letters7 August 2012Overdiagnosis of Invasive Breast Cancer due to Mammography ScreeningKarsten J. Jørgensen, MDKarsten J. Jørgensen, MDFrom The Nordic Cochrane Centre, 2100 Copenhagen, Denmark.Search for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-157-3-201208070-00022 SectionsAboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail TO THE EDITOR:We estimated 37% overdiagnosis of invasive breast cancer in Norway and 52% when we included cases of ductal carcinoma in situ (DCIS) (1). This means that 1 in 3 cases of breast cancer detected in the screened age group is overdiagnosed. We estimated 33% overdiagnosis in Denmark (2), which has the longest period worldwide that allows a contemporaneous comparison between screened and nonscreened areas.There are 3 main reasons for the difference between our estimates for Norway and the estimated 18% to 25% overdiagnosis of invasive breast cancer in Kalager and colleagues' study (3). We prefer the ...
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