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Mastectomies on the rise and MRI use may explain part of the trend, say Mayo researchers
Date:5/16/2008

ROCHESTER, Minn. -- The number of women undergoing mastectomy (total breast removal) for early-stage breast cancer has increased in the last three years at Mayo Clinic in Rochester. The increase follows a steady decline during the prior seven years.

Researchers say the reasons for this increase are unclear. But they have determined that women at Mayo Clinic who underwent diagnostic magnetic resonance imaging (MRI) prior to surgery to treat early-stage breast cancer had a higher rate of mastectomy, compared to women who did not have an MRI.

We found that if a woman undergoes an MRI before surgery, she is about 10 percent to 15 percent more likely to have a mastectomy, compared to women who did not undergo MRI, says the studys lead author, Rajini Katipamula, M.D., a senior clinical fellow in hematology/oncology.

Results will be presented May 31 at the 44th Annual Meeting of the American Society of Clinical Oncology (ASCO), and are being highlighted in an ASCO press conference on May 15. The studys senior author, Matthew Goetz, M.D., assistant professor of oncology at Mayo Clinic, will participate in that press conference.

Mayo researchers evaluated mastectomy trends by year and by use of preoperative breast MRI among 5,414 women who had surgery for early-stage breast cancer at Mayo Clinic between 1997 and 2006. They found that the mastectomy rate declined from 44 percent in 1997 to 30 percent in 2003, but then had risen to 43 percent in 2006. During this time, the percentage of women who had breast MRI more than doubled, from 11 percent in 2003 to 23 percent in 2006. The mastectomy rate was significantly higher in women who had a presurgical MRI (52 percent) compared to women who did not have the test and chose breast removal (41 percent).

Our study is the largest to examine the association between MRI and mastectomy rates at a single institution and may reflect national trends, says Dr. Goetz.

Dr. Goetz say
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Contact: Traci Klein
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

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