Validation of relapse risk biomarkers for routine use in patients with juvenile idiopathic arthritis

Friederike Rothmund, Joachim Gerss, Nicolino Ruperto, Jan Däbritz, Helmut Wittkowski, Michael Frosch, Nico M. Wulffraat, Lucy R. Wedderburn, Dirk Holzinger, Faekah Gohar, Sebastiaan J. Vastert, Riva Brik, Chantal Job Deslandre, Jose Antonio Melo-Gomes, Claudia Saad Magalhães, Roberto Barcellona, Ricardo Russo, Marco Gattorno, Alberto Martini, Johannes RothDirk Foell

Research output: Contribution to journalArticlepeer-review

Abstract

Objective. The myeloid-related proteins 8 and 14 (MRP-8/MRP-14) and neutrophil-derived S100A12 are biomarkers of inflammation. They can be used to determine the relapse risk in patients with juvenile idiopathic arthritis (JIA) after stopping antiinflammatory treatment. In this study, we tested the performance of different enzyme-linked immunosorbent assays (ELISAs) in order to validate systems available for routine use. Methods. MRP-8/MRP-14 and S100A12 serum concentrations of 188 JIA patients in remission were analyzed. Commercially available test systems were compared to experimental ELISAs established in house. The ability of the assays to identify JIA patients at risk for relapse was analyzed. Results. For MRP-8/MRP-14, the PhiCal Calprotectin and Bühlmann MRP8/14 Calprotectin ELISAs revealed hazard ratios of 2.3 and 2.1, respectively. For S100A12, the CircuLex S100A12/EN-RAGE ELISA revealed a hazard ratio of 3.1. The commercial assays allowed a JIA relapse prediction that was at least comparable to the experimental ELISAs. Conclusion. For the prediction of JIA relapse after stopping medication, the biomarkers MRP-8/MRP-14 and S100A12 can be determined by using assays that are available for routine use. The tested commercial MRP-8/MRP-14 and S100A12 ELISAs showed a performance comparable to well-established experimental ELISA protocols when assay-specific cutoffs for the indication of relapse prediction are thoroughly applied.

Original languageEnglish
Pages (from-to)949-955
Number of pages7
JournalArthritis Care and Research
Volume66
Issue number6
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Rheumatology

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