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Mammograms Every Other Year OK for Women Over 50: Study
Date:3/18/2013

By Kathleen Doheny
HealthDay Reporter

MONDAY, March 18 (HealthDay News) -- Some women 50 and older may be able to have a mammogram every other year without increasing their risk of developing an advanced breast cancer, according to a large new study on nearly 1 million women.

The findings are published online March 18 in JAMA Internal Medicine.

The study conclusions drew mixed reactions, including criticism for its methods, from other experts. Debate about who should get screened with mammography, and how often, has been ongoing.

In the new research, women aged 50 to 74 who got a screening mammogram every other year had a risk of developing advanced-stage breast cancer that was similar to that of women in the same age range who got the test every year.

The researchers evaluated nearly 12,000 women with breast cancer and more than 922,000 without, said researcher Dr. Karla Kerlikowske, a professor of medicine, epidemiology and biostatistics at the University of California, San Francisco School of Medicine.

The investigators considered whether the women had high breast density and whether they were taking combination hormone therapy with estrogen and progestin, both considered risk factors for breast cancer. Dense breasts have more glandular tissue and less fatty tissue.

"If you undergo [mammography every two years], you are not any more likely to end up with some advanced breast cancer than if you have annual screenings," Kerlikowske said of this group of women.

Screening every two years -- or biennially -- was also associated with a lower risk of having a false-positive result, the researchers found. False-positives -- suspicions of cancer that turn out not to be after more testing -- can cause more expense and distress, experts note.

However, for women aged 40 to 49 who have extremely dense breasts, the researchers found biennial mammograms were linked with nearly a twofol
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