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The impact of non-genetic and genetic factors on a stable warfarin dose in Thai patients.

Abstract：

PURPOSE:The aim of this study was to investigate the contributions of non-genetic and genetic factors on the variability of stable warfarin doses in Thai patients. METHODS:A total of 250 Thai patients with stable warfarin doses were enrolled in the study. Demographics and clinical data, e.g., age, body mass index, indications for warfarin and concomitant medications, were documented. Four single nucleotide polymorphisms in the VKORC1 - 1639G > A, CYP2C9*3, CYP4F2 rs2108622, and UGT1A1 rs887829 genes were detected from gDNA using TaqMan allelic discrimination assays. RESULTS:The patients with variant genotypes of VKORC1 - 1639G > A required significantly lower warfarin stable weekly doses (SWDs) than those with wild-type genotype (p < 0.001). Similarly, the patients with CYP2C9*3 variant allele required significantly lower warfarin SWDs than those with homozygous wild-type (p = 0.006). In contrast, there were no significant differences in the SWDs between the patients who carried variant alleles of CYP4F2 rs2108622 and UGT1A1 rs887829 as compared to wild-type allele carriers. Multivariate analysis, however, showed that CYP4F2 rs2108622 TT genotype accounted for a modest part of warfarin dose variability (1.2%). In contrast, VKORC1 - 1639G > A, CYP2C9*3, CYP4F2 rs2108622 genotypes and non-genetic factors accounted for 51.3% of dose variability. CONCLUSIONS:VKORC1 - 1639G > A, CYP2C9*3, and CYP4F2 rs2108622 polymorphisms together with age, body mass index, antiplatelet drug use, amiodarone use, and current smoker status explained 51.3% of individual variability in stable warfarin doses. In contrast, the UGT1A1 rs887829 polymorphism did not contribute to dose variability.

journal_name

Eur J Clin Pharmacol

journal_title

European journal of clinical pharmacology

authors

Wattanachai N,Kaewmoongkun S,Pussadhamma B,Makarawate P,Wongvipaporn C,Kiatchoosakun S,Vannaprasaht S,Tassaneeyakul W

doi

10.1007/s00228-017-2265-8

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

973-980

issue

8

eissn

0031-6970

issn

1432-1041

pii

10.1007/s00228-017-2265-8

journal_volume

73

pub_type

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