It's time to admit that mammograms are not perfect and that doctors
are treating women who don't need treatment for breast cancer, the
American Cancer Society's top doctor said Monday after yet another study
showed breast cancer screening leads to many so-called false positives.
The new study found that as many as a third of
women in Denmark diagnosed with breast cancer through mammograms either
didn't have malignant cancer, or had slow-growing tumors that didn't
need immediate treatment.
And regular mammograms did not catch more advanced cancers, the team wrote in the Annals of Internal Medicine.
"Breast cancer screening was not associated with a reduction in the
incidence of advanced cancer," Dr. Karsten Juhl Jørgensen of the Nordic
Cochrane Centre in Copenhagen and colleagues wrote.
"It is likely that one in every three invasive tumors and cases of DCIS diagnosed in screened women represent overdiagnosis."
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