Pharmacogenetics of warfarin in a paediatric population: time in therapeutic range, initial and stable dosing and adverse effects.

Hawcutt, Dan ORCID: 0000-0002-8120-6507, Ghani, A, Sutton, Laura, Jorgensen, Andrea ORCID: 0000-0002-6977-9337, Zhang, Eunice ORCID: 0000-0003-1813-2207, Murray, M, Michael, H, Peart, I, Smyth, Rosalind and Pirmohamed, Munir ORCID: 0000-0002-7534-7266 (2014) Pharmacogenetics of warfarin in a paediatric population: time in therapeutic range, initial and stable dosing and adverse effects. The Pharmacogenomics Journal, 14 (6). pp. 542-548.

This is the latest version of this item.

Text
Manuscript%20v9%20complete.docx - Author Accepted Manuscript
Download (153kB)

Official URL: https://www.nature.com/articles/tpj201431

Abstract

Warfarin is used in paediatric populations, but dosing algorithms incorporating pharmacogenetic data have not been developed for children. Previous studies have produced estimates of the effect of polymorphisms in Cytochrome P450 2C9 (CYP2C9) and vitamin K epoxide reductase complex subunit 1 (VKORC1) on stable warfarin dosing, but data on time in therapeutic range, initial dosing and adverse effects are limited. Participants (n=97) were recruited, and routine clinical data and salivary DNA samples were collected from all participants and analysed for CYP2C9*2, *3 and VKORC1-1639 polymorphisms.VKORC1 -1639 was associated with a greater proportion of the first 6 months' treatment time spent within the target International Normalised Ratio (INR) range, accounting for an additional 9.5% of the variance in the proportion of time. CYP2C9*2 was associated with a greater likelihood of INR values exceeding the target range during the initiation of treatment (odds ratio (OR; per additional copy) 4.18, 95% confidence interval (CI) 1.42, 12.34). CYP2C9*2 and VKORC1-1639 were associated with a lower dose requirement, and accounted for almost 12% of the variance in stable dose. VKORC1-1639 was associated with an increased likelihood of mild bleeding complications (OR (heterozygotes vs homozygotes) 4.53, 95% CI 1.59, 12.93). These data show novel associations between VKORC1-1639 and CYP2C9*2 and INR values in children taking warfarin, as well as replicating previous findings with regard to stable dose requirements. The development of pharmacogenomic dosing algorithms for children using warfarin has the potential to improve clinical care in this population.

Item Type:	Article
Additional Information:	## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords:	paediatric research, pharmacogenetics
Depositing User:	Symplectic Admin
Date Deposited:	30 Jun 2016 10:46
Last Modified:	19 Jan 2023 07:35
DOI:	10.1038/tpj.2014.31
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3001892