http://www.ncbi.nlm.nih.gov/pubmed/22817975
Mammography screening: truth, lies, and controversy.
Source
We could not find an effect of screening in Denmark, despite having a 17-year concomitant control area comprising 80% of the population where no-one was invited to screening.
2 And screening has not reduced the number of advanced cancers,
3 which is a prerequisite for screening to work. In Denmark, the overdiagnosis was 33% after 17 years with screening,
4 in good agreement with the 30% estimate from the trials.
5
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