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Association between apolipoprotein E genotype and warfarin response during initial anticoagulation.

Shuai He1, Huangmengjie Zhang1, Yide Cao1

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Summary

Apolipoprotein E (APOE) ε4 allele increases overanticoagulation risk in Han Chinese patients on warfarin. APOE genotypes do not reliably predict warfarin dose needs, impacting anticoagulation management.

Keywords:
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Area of Science:

  • Pharmacogenomics
  • Clinical Biochemistry

Background:

  • Apolipoprotein E (APOE) genotypes influence warfarin dose requirements in diverse populations.
  • The specific role of APOE genotypes in mediating warfarin response, particularly in early anticoagulation phases, remains unclear.

Purpose of the Study:

  • To investigate the impact of APOE genotypes on the early anticoagulation response to warfarin in Han Chinese patients.
  • To assess the association between APOE variants and warfarin dose requirements, therapeutic INR achievement, and bleeding events.

Main Methods:

  • Retrospective cohort study involving 429 Han Chinese patients.
  • Assessment of APOE genotypes (ε2, ε3, ε4 alleles), clinical data, INR levels, and warfarin dosage.
  • Analysis of time to therapeutic INR, time to INR > 4, and warfarin dose requirements.

Main Results:

  • Patients with at least one APOE ε4 allele showed significantly longer times to reach an INR > 4 compared to ε3/ε3 genotype (P < 0.001).
  • APOE ε4 allele was not a significant predictor for achieving the therapeutic INR range.
  • No significant association was found between APOE ε2 or ε4 alleles and warfarin maintenance dose requirements.

Conclusions:

  • APOE genetic variants, particularly the ε4 allele, are associated with an elevated risk of overanticoagulation in Han Chinese patients.
  • APOE genotypes may not be effective predictors for determining optimal warfarin maintenance doses.