Background: The aim of our study was to investigate the influence of conventional synthetic disease-modifying\nanti-rheumatic drugs (csDMARDs) and body mass index (BMI) on circulating drug levels and clinical response to\ntumour necrosis factor inhibitor (TNFi) therapy in axial spondyloarthritis (axSpA) patients.\nMethods: Prospective observational study during 1 year with 2 cohorts (Madrid and Amsterdam) including 180\naxSpA patients treated with standard doses of infliximab or adalimumab. Patients were stratified by BMI, being\n78 (43%) normal weight (18.5-24.9 kg/m^2) and 102 (57%) overweight/obese (less than equal to 25.0 kg/m^2). After the first year\nof treatment, TNFi trough levels were measured by capture ELISA. Clinical response to TNFi was defined as.................
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