Lookup NU author(s): Dr Tina Biss,
Professor Farhad Kamali
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© 2019, The Author(s), under exclusive licence to Springer Nature Limited. Studies on the effect of cytochrome P450 2C9 (CYP2C9), vitamin K epoxide reductase complex subunit 1 (VKORC1), and cytochrome P450 4F2 (CYP4F2) polymorphisms on warfarin maintenance dose in children are conflicting. We conducted a systematic review and meta-analysis to evaluate the effect of these polymorphisms on warfarin maintenance dose in children. We searched relevant literature using the MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trial libraries without any language restrictions from their inception to 23 July 2017. Dose differences are expressed as standardized mean difference (SMD) or mean difference (MD) with 95% confidence intervals (CI). This review was registered in the PROSPERO prospective register of systematic reviews (CRD42015016172). We included a total of nine studies (745 participants) in the meta-analysis. Patients with CYP2C9 *1/*2, *1/*3, *2/*2, *2/*3, or *3/*3 required a lower warfarin maintenance dose compared with patients with CYP2C9 *1/*1 (SMD = −0.610, 95% CI: −0.802 to −0.419, I2 = 0%). Patients with VKORC1-1639GA or AA required a lower warfarin maintenance dose compared with patients with VKORC1-1639GG (SMD = −0.666, 95% CI: −0.887 to −0.445, I2 = 33%). However, no associations were observed between CYP4F2 polymorphisms and warfarin maintenance dose (MD = 0.005 mg/kg/day, 95% CI: −0.006 to 0.015, I2 = 0%). These results were not affected by a sensitivity analysis. Our meta-analysis provides evidence that CYP2C9 and VKORC1 variant statuses affect warfarin maintenance dose in children, but not CYP4F2.
Author(s): Takeuchi M, Kobayashi T, Biss T, Kamali F, Vear SI, Ho RH, Bajolle F, Loriot M-A, Shaw K, Carleton BC, Hamberg A-K, Wadelius M, Hirono K, Taguchi M, Wakamiya T, Yanagimachi M, Hirai K, Itoh K, Brandao LR, Ito S
Publication type: Article
Publication status: Published
Journal: Pharmacogenomics Journal
Pages: Epub ahead of print
Online publication date: 01/11/2019
Acceptance date: 16/10/2019
ISSN (print): 1470-269X
ISSN (electronic): 1473-1150
Publisher: Nature Publishing Group
PubMed id: 31673144
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