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Abstract


DO VKORC1 AND CYP2C9 MUTATIONS LEAD TO WARFARİN RESISTANCE?

The objective of this study was to determine the influence of VKORC1 and CYP2C9 polymorphisms on warfarin resistant patients. Warfarin resistance is described as the inability to prolong the prothrombin time or raise the INR up to the 2 therapeutic range when the drug is given at typically doses. Polymorphisms may play a role as some VKORC1 and CYP2C9 variant alleles are known to be associated with these circumstances. 28 patients who were taking warfarin more than 15 mg/day and had INR values below 2.1 and had thromboembolic events while using warfarin were enrolled in this study. Heterozygote mutation in the VKORC1 gene was identified in 15 of 28 patients. Seven patients had heterozygote mutation of the CYP2C9 gene, and that may correspond to the ultrarapid metabolism of warfarin. VKORC1 and CYP2C9 polymorphism contribute to the difference in dose requirement amongst the patients, but other additional possible factors may play a role in different races. We suggest that medicians may use this tests before starting warfarin therapy and shape the treatment course according to this results.



Keywords
Mutation, Drug Resistance, Warfarin



Kaynakça 1. Oldenburg J, Müller CR, Rost S, Watzka M, Bevans CG. Comparative genetics of warfarin resistance. Hamostaseologie. 2014;34(2):143-59. doi: 10.5482/HAMO-13-09-0047. Epub 2013 Nov 29. PMID: 24287886.

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