Abstract
Women with reduced CYP2D6 activity have low endoxifen concentrations and likely worse long term benefits from tamoxifen. We investigated the association between CYP2D6 genotype and tamoxifen-induced hot flashes in a prospective cohort. We collected hot flash frequency and severity data over 12 months from 297 women initiating tamoxifen. We performed CYP2D6 genotyping using the AmpliChip CYP450 test and correlated inherited genetic polymorphisms in CYP2D6 and tamoxifen-induced hot flashes. Intermediate metabolizers had greater mean hot flash scores after 4 months of tamoxifen therapy (44.3) compared to poor metabolizers (20.6, P = 0.038) or extensive metabolizers (26.9, P = 0.011). At 4 months, we observed a trend toward fewer severe hot flashes in poor metabolizers compared to intermediate plus extensive metabolizers (P = 0.062). CYP2D6 activity may be a modest predictive factor for tamoxifen-induced hot flashes. The presence or absence of hot flashes should not be used to determine tamoxifen’s efficacy.
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Acknowledgments
This work was supported in part by the Pharmacogenetics Research Network grant number U-01 GM61373 (D.A.F.), which supports the Consortium on Breast Cancer Pharmacogenomics (COBRA); National Institutes of Health Clinical Pharmacology training grant number T32-GM08425 (D.A.F.); National Institute of General Medical Sciences, National Institutes of Health grant number K24RR020815 (D.A.F.); Damon Runyon-Lilly Clinical Investigator award CI-3 from the Damon Runyon Cancer Research Foundation (V.S.); and Fashion Footwear Charitable Foundation of New York/QVC Presents Shoes-on-Sale™ (D.F.H.) This publication was made possible by Grant Numbers M01-RR000042 (University of Michigan), M01-RR020359 (Georgetown University), and M01-RR00750 (Indiana University) from the National Center for Research Resources (NCRR), a component of the National Institutes of Health (NIH). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of NCRR or NIH.
Conflicts of interest statement
N.L.H. is on the Scientific Advisory Board of Otsuka Pharmaceuticals and has received research funding from AstraZeneca and Lilly Pharmaceuticals. J.M.R. has received research funding from Pfizer and speaking honoraria for Roche Diagnostics. T.S. has received speaking honoraria for Roche Diagnostics. AMS is a member of the speaker’s bureau and receives research funding from Glaxo-Smith Kline and is a consultant to Eli Lilly and Company. D.A.F. is on the Scientific Advisory Boards of Labcorp, Inc. and Otsuka Pharmaceuticals, is a consultant to Roche Molecular Diagnostics, and has received research funding from Pfizer and Novartis. D.F.H. has received research funding from AstraZeneca, Glaxo-Smith Kline, Pfizer, and Novartis. V.S. is on the Scientific Advisory Board of Otsuka Pharmaceuticals, has served as a consultant to Wyeth Pharmaceuticals, Concert Pharmaceuticals and JDS Pharmaceuticals, and has received research funding from Glaxo-Smith Kline, Pfizer, and Novartis.
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The description of the study design can be found on http://www.clinicaltrials.gov (NCT00228930).
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Lynn Henry, N., Rae, J.M., Li, L. et al. Association between CYP2D6 genotype and tamoxifen-induced hot flashes in a prospective cohort. Breast Cancer Res Treat 117, 571–575 (2009). https://doi.org/10.1007/s10549-009-0309-1
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DOI: https://doi.org/10.1007/s10549-009-0309-1