The Canadian National Breast Screening Study Ignites A New Round In The Mammography Wars

“The Canadian Screening Study Ignites A New Round In The Mammography Wars,” by David Gorski, Science-Based Medicine.

The Twenty five year follow-up for breast cancer incidence and mortality of the Canadian National Breast Screening Study (CNBSS), a randomized screening trial, found that mammograms didn’t reduce breast cancer mortality compared to routine care.

Gorski gives background on CNBSS, which began in 1980 to compare regular breast examination to breast exam plus screening mammography for those aged 50 to 59, and to compare screening mammography plus “usual care” for women aged 40 to 49. The post also provides detailed information about the 1963 HIP study (the New York Health Insurance Plan study) –the first study of screening mammograms in the United States, earlier published results from the CNBSS, criticisms and limitations of CNBSS, and what CNBSS confirms about screening mammograms.

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