Abstract:Background Methotrexate (MTX) is an anchor drug in the treatment of rheumatoid arthritis (RA). We previously performed a cross-sectional, observational study and reported an association between the gene expression level of the drug transporter ABCG2/BCRP (breast cancer resistance protein) and RA disease control in patients receiving MTX. Methods We designed a prospective study in two medical centers in Japan to confirm the association of ABCG2 gene expression level with the clinical response to MTX in MTX-naiv… Show more
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