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Newly identified markers may predict who will respond to breast cancer prevention therapy
Date:6/13/2013

PHILADELPHIA Genetic variations, known as single nucleotide polymorphisms (SNPs), in or near the genes ZNF423 and CTSO were associated with breast cancer risk among women who underwent prevention therapy with tamoxifen and raloxifene, according to data published in Cancer Discovery, a journal of the American Association for Cancer Research.

Women who have the favorable variations of these two SNPs are more likely to respond to prevention therapy, according to this study. Women who have the unfavorable variations of these SNPs may not benefit from prevention therapy, and they have a five-fold increased risk of developing breast cancer.

"The recent guidelines by the U.S. Preventive Services Task Force emphasize that selective estrogen receptor modulator (SERM) therapy with tamoxifen and raloxifene can lower a woman's risk for developing breast cancer. But about 50 women have to be exposed to the treatment and side effects to prevent a single case of breast cancer," said James N. Ingle, M.D., professor of oncology at the Mayo Clinic in Rochester, Minn.

"Our findings are important, because for the first time, we discovered genetic factors that could be used to select women who should be offered the drugs for prevention. Also of substantial importance is that we have discovered new information on how tamoxifen and raloxifene work to prevent breast cancer."

Ingle and his colleagues at the Mayo Clinic, along with researchers at the National Surgical Adjuvant Breast and Bowel Project (NSABP) in Pittsburgh, Pa., and the RIKEN Center for Genomic Medicine in Tokyo, Japan, conducted a genome-wide association study involving 592 patients who developed breast cancer while on SERM therapy and 1,171 matched controls. They selected participants from the 33,000 women enrolled in the NSABP P-1 and P-2 breast cancer prevention trials.

He and his colleagues analyzed participants' DNA using the Illumina Human610-Quad BeadChip
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Contact: Jeremy Moore
jeremy.moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

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