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Elevated faecal calprotectin is linked to worse disease status in axial spondyloarthritis: results from the SPARTAKUS cohort.

Journal article
Authors Tor Olofsson
Elisabeth Mogard
Kristofer Andréasson
Jan Marsal
Mats Geijer
Lars Erik Kristensen
Johan K Wallman
Published in Rheumatology (Oxford, England)
ISSN 1462-0332
Publication year 2019
Published at Institute of Clinical Sciences, Department of Radiology
Language en
Links dx.doi.org/10.1093/rheumatology/key...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Rheumatology and Autoimmunity

Abstract

To examine faecal calprotectin (F-calprotectin) levels and presence of anti-Saccharomyces cerevisiae antibodies (ASCA) and their associations with disease subtype and current status in axial SpA (axSpA).F-calprotectin and ASCA in serum were compared between consecutive patients with a clinical axSpA diagnosis, classified as non-radiographic axSpA (nr-axSpA; n = 40) or AS (n = 90), and with healthy controls (n = 35). Furthermore, standard axSpA outcome measures were compared between axSpA patients (nr-axSpA and AS combined) with elevated vs normal F-calprotectin, ASCA IgA and IgG, respectively.Elevated F-calprotectin (⩾50 mg/kg) was observed in 27% of nr-axSpA patients, 38% of AS patients and 6% of controls. F-calprotectin was significantly higher in AS vs nr-axSpA [AS: geometric mean 41 (95% CI 32, 54) mg/kg; nr-axSpA: 24 (95% CI 16, 38) mg/kg; P = 0.037], and in each axSpA subtype vs controls. Overall, worse disease activity and physical function scores were observed among axSpA patients with elevated vs normal F-calprotectin levels, with significant differences regarding patient's visual analogue scale for global health, ASDAS using CRP, and BASFI (adjusted for age, sex, NSAID use, anti-rheumatic treatments, and CRP). ASCA titres and seropositivity (⩾10 U/ml) were similar in nr-axSpA (IgA/IgG-seropositivity: 8%/26%) and AS (7%/28%), and clinical outcome measures did not differ between patients with elevated vs normal ASCA IgA or IgG, respectively. Compared with controls (IgA/IgG-seropositivity: 0%/17%), ASCA IgA was significantly higher in both axSpA subtypes, and IgG was significantly higher in the AS group.In patients with axSpA, gut inflammation measured by elevated F-calprotectin is associated with worse disease activity and physical function, and may be a marker of more severe disease.

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