(Medical Xpress)—When people think about genes and their relationship to cancer, most probably think about a person's hereditary cancer risk, especially after Angelina Jolie's recent news about her inherited breast and ovarian cancer risk associated with the BRCA1 and BRCA2 gene abnormalities. But genetic counselors will tell you that only about 5 to 10 percent of cancers are caused by inherited genetic mutations.
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