Abstract
Purpose of Review
Methotrexate (MTX) is the most widely used disease-modifying antirheumatic drug (DMARD) in paediatric rheumatology and the mainstay in the therapy of juvenile idiopathic arthritis (JIA). Despite its common use, about 30% of children fail to respond to this medicine that results in potentially irreversible joint damage.
Recent Findings
No clinical biomarker that would predict the outcome of MTX therapy exists. Results of several studies focused on gene polymorphisms and outcome of this DMARD therapy have been published, but no reliable genetic marker useful to tailor the therapy has been discovered so far. The results of the first genome-wide association study in this field have recently revealed new genetic candidates from outside the metabolic pathway of MTX that may be associated with the efficacy of treatment.
Summary
However promising, those outcomes need validation in independent prospective cohorts before we can claim that clinically useful biomarker predicting MTX treatment response is discovered.
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Acknowledgements
This study was funded by the grant no. 503/8-000-01/503-81-002 from Medical University of Lodz, Poland.
Authors’ Contributions
JR contributed substantially to the design, performance and reporting of the work. ES contributed to the study for important intellectual content and was involved in the drafting of the manuscript and article’s revising.
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A systematic literature search was performed in PubMed Library. The search included phrases “methotrexate”, “juvenile idiopathic arthritis” and “gene polymorphism”. Three hundred thirty articles were found, dating from 1992 to 2016. Thirty-eight of them were referred to while preparing this article.
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This article is part of the Topical Collection on Pediatric Rheumatology
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Roszkiewicz, J., Smolewska, E. In the Pursuit of Methotrexate Treatment Response Biomarker in Juvenile Idiopathic Arthritis—Are We Getting Closer to Personalised Medicine?. Curr Rheumatol Rep 19, 19 (2017). https://doi.org/10.1007/s11926-017-0646-8
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DOI: https://doi.org/10.1007/s11926-017-0646-8