CYP2C9, VKORC1, and CYP4F2 polymorphisms and pediatric warfarin maintenance dose: a systematic review and meta-analysis

Masanobu Takeuchi, Tohru Kobayashi, Tina Biss, Farhad Kamali, Susan I. Vear, Richard H. Ho, Fanny Bajolle, Marie Anne Loriot, Kaitlyn Shaw, Bruce C. Carleton, Anna Karin Hamberg, Mia Wadelius, Keiichi Hirono, Masato Taguchi, Takuya Wakamiya, Masakatsu Yanagimachi, Keita Hirai, Kunihiko Itoh, Leonardo R. Brandão, Shinya Ito*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)306-319
Number of pages14
JournalPharmacogenomics Journal
Volume20
Issue number2
DOIs
StatePublished - 2020/04/01

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Pharmacology

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