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Biennial mammograms best after 50, even for women with dense breasts
Date:3/19/2013

Screening for breast cancer every two years appears just as beneficial as yearly mammograms for women ages 50 to 74, with significantly fewer "false positives" even for women whose breasts are dense or who use hormone therapy for menopause.

That is the finding of a new national study involving more than 900,000 women.

The study was published on March 18 in JAMA Internal Medicine.

The same team of researchers from UC San Francisco and Seattle-based Group Health Research Institute recently reported similar results for older women ages 66 to 89 years old.

By contrast, women in their 40s with extremely dense breasts who undergo biennial mammography are more likely to have advanced-stage and large tumors than women who undergo annual mammography but annual mammograms also resulted in more false positives, according to the new study from the Breast Cancer Surveillance Consortium (BCSC), the largest available screening mammography dataset in the United States. Having dense breasts means it is difficult for X-rays to pass through the breast tissue.

"Increasing age and high breast density are among the strongest risk factors for the disease," said senior author Karla Kerlikowske, MD, a professor of medicine at UCSF and a physician at the UCSF-affiliated San Francisco VA Medical Center.

Kerlikowske and other BCSC researchers reported in 2012 that risk factors may inform individual decisions that women make with their doctors about when to start breast cancer screening and how often to repeat it. For instance, a family history of breast cancer raises the likelihood of developing the disease but it does not increase the chances of advanced-stage tumors or large tumors.

"These individual decisions involve evaluating the balance between the benefits of screening detecting cancer early and the potential harms, such as false positives among healthy women," Kerlikowske said. "Some people who are
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Contact: Elizabeth Fernandez
elizabeth.fernandez@ucsf.edu
415-502-6397
University of California - San Francisco
Source:Eurekalert  

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