A genetic mutation that raises the risk of breast cancer is found in up to 60 percent of U.S. women, making it the first truly common breast cancer susceptibility gene, researchers reported on Sunday.Reports from several teams around the world identified changes in four other genes that raise the risk of breast cancer significantly. Several are found in many men and women.
More than 60 percent of the women in the United States probably carry at least one of the mutations in one of the genes, called FGFR2, the researchers said.
"This is a truly landmark breakthrough for breast cancer research, because these genes are the first confirmed common genetic risk factors for breast cancer," said Jianjun Liu of the Genome Institute of Singapore, who took part in one of the studies.
The researchers, reporting in the journals Nature and Nature Genetics, said the discoveries are the most important genes associated with breast cancer since BRCA1 and BRCA2 were identified.
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