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Gene Test Might Predict Tamoxifen's Effectiveness

Gene Test Might Predict Tamoxifen's Effectiveness

October 6, 2009 - 3:55pm 212 reads 0 comments

TUESDAY, Oct. 6 (HealthDay News) -- A genetic variant seems to predict resistance to the breast cancer drug tamoxifen, German researchers report.

The findings, which appear in the Oct. 7 issue of the Journal of the American Medical Association, could allow clinicians to predict which women will benefit most from the drug, which has been the gold standard of breast cancer care for the past 25 years. Women who do carry the gene variant may be candidates for alternative treatments.

The gene affects the activity of the CYP2D6 enzyme, which converts tamoxifen into its metabolite, endoxifen. It is this metabolite that allows the drug to work its magic against breast tumors.

"This is really the largest study that's been done in this area," noted V. Craig Jordan, scientific director of Georgetown Lombardi Comprehensive Cancer Center in Washington, D.C. "It's now clear if you don't have the ability to create endoxifen out of tamoxifen, you don't have a good response rate. This is really important because for women who are taking the drug for five years, you better know it's going to work for you."

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