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Genetic determinants of methotrexate treatment in rheumatoid arthritis patients: a study of polymorphisms in the adenosine pathway
  1. Petra Bohanec Grabar1,
  2. Sabina Rojko1,
  3. Dušan Logar2,
  4. Vita Dolžan1
  1. 1Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
  2. 2Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia
  1. Correspondence to Vita Dolžan, Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia; vita.dolzan{at}mf.uni-lj.si

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Methotrexate (MTX) is a disease-modifying antirheumatic drug (DMARD) used for the treatment of rheumatoid arthritis (RA). Genetic polymorphisms in AMP deaminase (AMPD1), 5-aminoimidazole-4-carboxamide ribonucleotide formyltransferase (ATIC), inosine triphosphate pyrophosphorylase (ITPA) and methylenetetrahydrofolate dehydrogenase (MTHFD1) were shown to be associated with disease activity, MTX treatment response and MTX-induced toxicity in patients with RA.1,,6 The aim of our study was to test these associations in Slovenian patients with RA treated with MTX.

Our study included 211 patients with RA who were previously characterised.7 Among them, 98 patients were receiving MTX monotherapy, 57 co-treated with one or more DMARD and 56 discontinued MTX before enrolment owing to MTX inefficacy and/or toxicity. The 28-joint count Disease Activity Score (DAS28) …

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