Study: 1.3 Million Overdiagnosed Breast Cancers in 30 Years

http://www.medscape.com/viewarticle/774966

In the past 30 years, an estimated 1.3 million American women had breast cancers that were "overdiagnosed," which means their screening-detected tumors would never have led to clinical symptoms, according to a study published in the November 22 issue of the New England Journal of Medicine.

In 2008 alone, breast cancer was overdiagnosed in an estimated 70,000-plus women, which was 31% of all breast cancers diagnosed that year, assert the study authors, Archie Bleyer, MD, from the Oregon Health and Science University in Portland, and H. Gilbert Welch, MD, MPH, from the Geisel School of Medicine at Dartmouth College in Hanover, New Hampshire.

Overall, about one third of all breast cancers detected in the United States are overdiagnosed, they say.

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