Abstract
To date, functional MTHFR SNPs have been tested for their impact on low-dose methotrexate (MTX) response in small rheumatoid arthritis (RA) cohorts. We sought to test their effect in the single largest cohort studied to date, and undertook a meta-analysis utilizing stringent study inclusion criteria. RA patients treated with MTX monotherapy from the Yorkshire Early Arthritis Register (YEAR) were genotyped using RFLP assays, and tested for association with treatment efficacy. Studies for meta-analysis were screened by a set of stringent inclusion criteria. rs1801131 and rs1801133 were not associated with response to MTX in the YEAR cohort, nor did they affect the probability of achieving a low disease activity state. A meta-analysis of comparable studies found no association with these SNPs. MTHFR SNPs rs1801131 and rs1801133 are unlikely to have a clinically meaningful effect on the first 6 months of MTX treatment in early RA.
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