The association of RFC1 80G/A polymorphism with MTX efficacy or toxicity in RA patients has been comprehensively analyzed.
All genetic models of RFC1 80G/A have been examined.
RFC1 80G/A gene polymorphism is strongly associated with MTX efficacy in both total population and Asian subgroup analysis.
No association between RFC1 80G/A and MTX related-toxicity was detected in both total population and subgroup analysis.
RFC1 80G/A polymorphism is a potential predictor for MTX response, but not a useful biomarker for MTX-related toxicity.