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Pharmacy Clinical Coordinator Pharmacy Department Wesley Long Community Hospital 501 North Elam Avenue Greensboro, North Carolina 27403-1199 FAX 336/832-1960 E-mail randy.absher{at}mosescone.com
Nutrition Support Dietitian Wesley Long Community Hospital
Director, Cardiovascular Risk Reduction Clinics LeBauer Healthcare Greensboro, North Carolina
Published Online, February 3, 2003. www.theannals.com, DOI 10.1345/aph.1C025b
We concur that differences in CYP2C9 polymorphism prevalence as described by Lindh could explain larger mean warfarin dosage requirements in African Americans when compared with white patients. The CYP2C9 polymorphisms described to date, however, are less likely to explain the specific frequency distributions we observed. In a further analysis of our data, we omitted the lowest warfarin-dosage quartile to ostensibly exclude the majority of subjects of all ethnicities with slow-metabolizer CYP2C9 polymorphisms. This transformation still yielded disparate frequency distributions for warfarin dosages among subjects of different ethnicities, with disproportionate numbers of African Americans requiring larger warfarin dosages. The relatively small sample size of our study cohort precludes definitive inferential analysis under this approach. We believe further exploration in larger groups of patients is appropriate.
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