Genetic and Clinical Predictors of Warfarin Dose Requirements in African Americans
Copyright policy )Genetic and Clinical Predictors of Warfarin Dose Requirements in African Americans
The objective of this study was to determine whether, in African-American patients, additional vitamin K oxidoreductase complex subunit 1 (VKORC1), cytochrome P450 2C9 (CYP2C9), CYP4F2, or apolipoprotein E (APOE) polymorphisms contribute to variability in the warfarin maintenance dose beyond what is attributable to the CYP2C9*2 and *3 alleles and the VKORC1 -1639G>A genotype. In a cohort of 226 African-American patients, weekly warfarin dose requirements were lower in those with the CYP2C9*8 allele (34 (30-47) mg; P = 0.023) and the CYP2C9 *2, *3, *5, *6, or *11 allele (33(28-40 mg); P A genotype, and clinical variables explained 36% of the interpatient variability in warfarin dose requirements. By comparison, a model without the CYP2C9*5, *6, *8, and *11 alleles explained 30% of the variability in dose. No other VKORC1, CYP4F2, or APOE polymorphism contributed to the variance. The inclusion of additional CYP2C9 variants may improve the predictive ability of warfarin dosing algorithms for African Americans.
- University of Illinois at Chicago United States
- University of Florida United States
Adult, Male, Polymorphism, Genetic, Dose-Response Relationship, Drug, Genotype, Anticoagulants, Middle Aged, Mixed Function Oxygenases, Black or African American, Apolipoproteins E, Vitamin K Epoxide Reductases, Humans, Female, Aryl Hydrocarbon Hydroxylases, Warfarin, Algorithms, Alleles, Aged, Cytochrome P-450 CYP2C9
Adult, Male, Polymorphism, Genetic, Dose-Response Relationship, Drug, Genotype, Anticoagulants, Middle Aged, Mixed Function Oxygenases, Black or African American, Apolipoproteins E, Vitamin K Epoxide Reductases, Humans, Female, Aryl Hydrocarbon Hydroxylases, Warfarin, Algorithms, Alleles, Aged, Cytochrome P-450 CYP2C9
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