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Gene that causes tumor disorder linked to increased breast cancer risk
Date:11/26/2012

New Johns Hopkins research showing a more than four-fold increase in the incidence of breast cancer in women with neurofibromatosis-1 (NF1) adds to growing evidence that women with this rare genetic disorder may benefit from early breast cancer screening with mammograms beginning at age 40, and manual breast exams as early as adolescence.

In a small study of 126 women with NF1 at the Johns Hopkins Comprehensive Neurofibromatosis Center, the Johns Hopkins scientists identified four cases of breast cancer. The study showed a four-fold increased risk for breast cancer in women with NF1 compared to the general population of women under the age of 50. NF1 is characterized by the uncontrolled growth of mostly non-cancerous tumors along the body's nerves, often resulting in pain and disfigurement.

Beyond their implications for breast cancer screening guidelines for women with NF1, the findings may also shed light on the origins and nature of breast cancer in those without the syndrome, the researchers say, because other recent studies suggest that some women without neurofibromatosis-1 had breast cancers fueled primarily by an NF1 mutation. A recent study, for example, described in the journal Nature, estimated that 3 percent of all breast cancers in the general population are caused by NF1 mutations that arise spontaneously.

"When we study rare populations intensively, we learn things that also may be factors in very common diseases, like breast cancer," says Jaishri Blakeley, M.D., an assistant professor of neurology, neurosurgery and oncology at the Johns Hopkins University School of Medicine, and leader of the new study described online in the American Journal of Medical Genetics. "What we learn from this population will help us learn more about the subtleties of different types of breast cancers."

The major implication of their study, Blakeley says, is the need for medical specialty societies to develop guidelines recogn
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Contact: Stephanie Desmon
sdesmon1@jhmi.edu
410-955-8665
Johns Hopkins Medicine
Source:Eurekalert

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