A subgroup of juvenile idiopathic arthritis patients who respond well to methotrexate are identified by the serum biomarker MRP8/14 protein - Moncrieffe, H; Ursu, S; Holzinger, D; Patrick, F; Kassoumeri, L; Wade, A; Roth, J; Wedderburn, L R (Rheumatology (Oxford), 2013)