While the medical community continues to debate the benefits of CYP2D6 genetic testing for women on the breast cancer treatment tamoxifen, patients using the medication are anxious to have the tests. According to a new survey of more than 700 women with breast cancer currently taking tamoxifen, almost 80 percent of respondents would choose to have a genetic test that determines CYP2D6 genotype, yet only 14 percent of these women have been tested. CYP2D6 is an enzyme that influences how well the body processes tamoxifen into its more active form.
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