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Differences in Predicted Warfarin Dosing Requirements Between Hmong and East Asians Using Genotype-Based Dosing

Boguang Sun1, Ya-Feng Wen1, Kathleen A Culhane-Pera2

  • 1Department of Experimental and Clinical Pharmacology, College of Pharmacy, University of Minnesota, Minneapolis, Minnesota, USA.

Pharmacotherapy
|November 17, 2020
PubMed
Summary

Warfarin dosing needs vary significantly between Hmong and East Asian populations due to genetic differences in CYP2C9 and VKORC1. These variations impact predicted warfarin sensitivity and required maintenance doses.

Keywords:
Asian Americansanticoagulant drugsminority healthpharmacogeneticsprecision medicinewarfarin

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Area of Science:

  • Pharmacogenetics
  • Genomics
  • Clinical Pharmacology

Background:

  • Warfarin (Coumadin) has a narrow therapeutic index, making precise dosing crucial.
  • Genetic variations significantly influence individual warfarin response and dosage requirements.
  • The Hmong population, a large Asian subgroup in the US, is underrepresented in pharmacogenetic research.

Purpose of the Study:

  • To validate previously reported allele frequency differences for warfarin-related genes (CYP2C9, VKORC1, CYP4F2) in Hmong individuals compared to East Asians.
  • To compare predicted warfarin sensitivity and maintenance doses between Hmong and East Asian cohorts.

Main Methods:

  • Genotyping of CYP2C9 (*2, *3), VKORC1 (G-1639A), and CYP4F2 (*3) in two Hmong cohorts (n=433).
  • Comparison of allele frequencies with the International Warfarin Pharmacogenetics Consortium (IWPC) East Asian cohort (n=1165) using chi-squared tests.
  • Comparison of predicted warfarin sensitivity and mean maintenance doses using chi-squared and t-tests.

Main Results:

  • Significant differences in allele frequencies for CYP2C9*3 and CYP4F2*3 were observed between the Hmong and East Asian cohorts.
  • The Hmong cohort showed a significantly higher percentage of individuals predicted to be very sensitive to warfarin (28% vs 5%).
  • The mean predicted warfarin maintenance dose was significantly lower for the Hmong cohort (19.8 mg/week) compared to East Asians (21.3 mg/week).

Conclusions:

  • Unique warfarin-related allele frequencies in the Hmong population, combined with non-genetic factors, lead to clinically significant differences in predicted maintenance doses compared to East Asians.
  • These findings highlight the need for population-specific pharmacogenetic considerations in warfarin therapy.
  • Further research is warranted to confirm these predictions in clinical practice and optimize warfarin dosing strategies for the Hmong population.