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More Mammograms Equal More Mastectomies: Study
Date:9/14/2011

By Maureen Salamon
HealthDay Reporter

TUESDAY, Sept. 13 (HealthDay News) -- One of the goals of mammograms is detecting breast cancer early enough to avoid needing a mastectomy. But a new Norwegian study suggests that mastectomy rates climb higher as more women undergo the screening test.

Using national cancer data for more than 35,000 women aged 40 to 79 who were diagnosed with early or invasive breast cancers, Oslo researchers found a 31 percent increased risk of mastectomy in women invited to screening compared with a non-invited younger age group. The Norwegian breast cancer screening program began in 1996 in four counties, encompassing the country's remaining 15 counties by 2004.

While scientists did not investigate why mastectomy rates climbed in screened groups, study author Pal Suhrke said the main reason is likely "cancer overdiagnosis," or the detection and subsequent treatment of tumors that might grow very slowly and not pose much of a risk.

"Since the introduction of screening is associated with a more than 50 percent increase in breast cancer rates, some of these women are treated by mastectomy," said Suhrke, a doctoral candidate in the pathology department at Oslo University Hospital. "For many, these results are surprising and disappointing because one might suspect that due to earlier detection of tumors, the number of women needing mastectomies would decrease."

The study is published in the Sept. 13 online edition of BMJ.

Suhrke and his colleagues found that the country's annual mastectomy rate rose by 9 percent in women aged 50 to 69 -- the group invited to screening -- between the pre-screening period from 1993 to 1995 and the introduction of biennial screening from 1996 to 2004.

In contrast, mastectomy rates fell by 17 percent in non-invited women aged 40 to 49 and 13 percent in non-invited women aged 70 to 79.

Dr. Stephanie Bernik, chief of surgical onc
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