Factor VII R353Q genetic polymorphism is associated with altered warfarin sensitivity among CYP2C9 *1/ *1 carriers

Liat Mlynarsky, Idit Bejarano-Achache, Mordechai Muszkat, Yoseph Caraco*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Objective: Warfarin responsiveness is characterized by marked interindividual variability. A major portion of this variability is attributed to CYP2C9 and VKORC1 polymorphisms, but almost 50% is still unaccounted for. This paper reports the first prospective study on the association between factor VII R353Q polymorphism and warfarin responsiveness during induction. Methods: Genotyping for factor VII R353Q and 323D/I polymorphisms was performed in a cohort consisting of 374 patients (198 CYP2C9 *1/ *1) treated with warfarin who were prospectively followed from warfarin initiation. Results: Compared with *1/ *1-R/R and *1/ *1-R/Q genotype carriers, *1/ *1-Q/Q homozygotes achieved higher International Normalized Ratio (INR) values while consuming lower warfarin doses. The greater sensitivity was illustrated by 82.1% higher Warfarin Sensitivity Index During Induction (WSIDI) (0.14 ± 0.11 vs. 0.08 ± 0.50 mg -1 Mann-Whitney, P=0.043). Multiple regression analysis consisting of both genetic and nongenetic factors explained 26% of WSIDI variability, with R353Q genetic polymorphism having a modest yet significant effect and accounting for 1.7% of the overall variability. Moreover, the incidence of overanticoagulation (i.e., INR>4) was 6.94-fold higher among *1/ *1-Q/Q vs. *1/ *1-R/R&R/Q carriers during warfarin induction (Pearson chi-square, P=0.005). These findings were not accounted for by a chance difference in the distribution of VKORC1 genotypes. Analysis of these parameters among the entire cohort, including CYP2C9 *2 and CYP2C9 *3 variant allele carriers, did not reach statistical significance. Warfarin responsiveness during induction was unrelated to factor VII 323D/I genetic polymorphism. Conclusions: The response to warfarin during induction is influenced by factor VII R353Q polymorphism. The prospective use of this polymorphism, along with CYP2C9 and VKORC1, may enhance the accuracy of warfarin loading. However, the impact of R353Q polymorphism on overall warfarin response is subtle, and it is therefore unlikely that its use would be of clinical importance.

Original languageAmerican English
Pages (from-to)617-627
Number of pages11
JournalEuropean Journal of Clinical Pharmacology
Issue number5
StatePublished - May 2012
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgments The study was supported by a grant from the BiNational US–Israel Science Foundation (YC), a grant from the Israeli Science Foundation (YC) and a grant from the Israeli Ministry of Health (YC). We greatly appreciate the administrative help of Miss Ilanit Linzer.


  • Anticoagulation
  • Factor VII
  • Genetic polymorphism
  • Warfarin


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