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Serum calprotectin as a marker of ultrasound-detected synovitis in early psoriatic and rheumatoid arthritis: results from a cross-sectional retrospective study. | LitMetric

AI Article Synopsis

Article Abstract

Objectives: We aimed to evaluate the correlation between serum calprotectin and clinical and ultrasonographic (US) variables in early-onset psoriatic arthritis (PsA) and controls with rheumatoid arthritis (RA).

Methods: In a retrospective cross-sectional study, including PsA and matched RA patients, 44 joint counts (TJC, SJC), calprotectin, ESR and CRP were measured. US of wrists and MCPs 1-5 was performed, with grey-scale (GS) and power Doppler (PD) scored 0-3 at each site, summed in a total score. The correlation between calprotectin, clinical and US variables was evaluated by Spearman's coefficient, the predictivity by calprotectin of US by regression. Secondary analyses separating polyarticular PsA and using different US definitions (GS>1, PD>1) were performed.

Results: 78 PsA and 78 RA were included (PsA male 32%; mean age 51.7 (13.5)). Calprotectin did not significantly differ in PsA and RA. In PsA, calprotectin correlated with GS score (ρ=0.340, p=0.008), PD score (ρ=0.292, p=0.023) and the presence of PD (ρ=0.263, p=0.042); in RA there were no significant correlations. In polyarticular PsA, a significant correlation between calprotectin and GS (ρ=0.369, p=0.019) and PD scores (ρ=0.363, p=0.021) was confirmed. In both PsA and RA, calprotectin and CRP significantly correlated, while SJC and TJC did not. In the regression analysis, calprotectin did not predict US variables in PsA. Similar results were achieved in RA.

Conclusions: In early PsA, serum calprotectin correlates with US measures of disease activity. Our results provide preliminary evidence for the application of this biomarker in early PsA.

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