Abstract
The aim of this study was to explore whether the C677T and A1298C polymorphisms of methylenetetrahydrofolate reductase (MTHFR) play a role in methotrexate (MTX) toxicity in rheumatoid arthritis (RA). MEDLINE and EMBASE database searches and subsequent manual searches were utilized to identify articles in which C677T and A1298C MTHFR polymorphisms were evaluated in RA patients taking MTX. A meta-analysis was conducted to identify associations between MTHFR polymorphisms and MTX toxicity. Twelve studies comprising a total of 2,288 RA patients were included in our meta-analysis. Meta-analysis revealed an association between the overall toxicity of MTX and the MTHFR 677TT genotype (odds ratio [OR] = 1.615, 95 % confidence interval [CI] = 1.185–2.200, p = 0.002). Stratification by ethnicity indicated an association between the MTHFR 677TT genotype and the overall toxicity of MTX in East Asians (OR = 1.583, 95 % CI = 1.075–2.331, p = 0.020). The toxicity of MTX also was found to be associated with the TT genotype in patients taking folate (OR = 1.893, 95 % CI = 1.283–2.793, p = 0.001). Stratification by toxicity type indicated an association between the MTHFR 677TT genotype and any adverse effects (OR = 1.716, 95 % CI = 1.127–2.612, p = 0.012). Meta-analysis stratified by toxicity type indicated an association between the MTHFR 1298CC genotype and any adverse effects (OR = 0.501, 95 % CI = 0.284–0.886, p = 0.017). The results of our meta-analysis suggest that the MTHFR C677T and A1298C polymorphisms are associated with MTX toxicity in RA patients.
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This study was supported by a grant from the Korean Healthcare Technology R&D Project, Korean Ministry of Health and Welfare (HI12C1834).
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Song, G.G., Bae, SC. & Lee, Y.H. Association of the MTHFR C677T and A1298C polymorphisms with methotrexate toxicity in rheumatoid arthritis: a meta-analysis. Clin Rheumatol 33, 1715–1724 (2014). https://doi.org/10.1007/s10067-014-2645-8
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DOI: https://doi.org/10.1007/s10067-014-2645-8