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  • Title: Inflammation and vascularisation markers of arthroscopically-guided finger joint synovial biospies reflect global disease activity in rheumatoid arthritis.
    Author: Vordenbäumen S, Sewerin P, Lögters T, Miese F, Schleich C, Bleck E, Philippski P, Schädel-Höpfner M, Pauly T, Schneider M, Ostendorf B.
    Journal: Clin Exp Rheumatol; 2014; 32(1):117-20. PubMed ID: 24387883.
    Abstract:
    OBJECTIVES: To analyse whether synovial markers of the clinically dominant metacarpophalangeal (MCP) joint reflect global disease activity measures in rheumatoid arthritis (RA). METHODS: Arthroscopically-guided synovial biopsies from the dominant metacarpophalangeal (MCP) joint of 10 patients with RA (DAS28 >3.2) were stained for determination of the synovitis score, CD68, vascular endothelial growth factor (VEGF), hypoxia-inducible factor 1α (HIF-1α). MRI and ultrasound were used to calculate the RAMRIS and US7 score respectively. Arthroscopy of the same joint was repeated in 6 patients after 6 months. RESULTS: The synovitis score significantly correlated to DAS28 (Spearman r=0.74), CRP (r=0.69), and US7 (r=0.66); sublining CD68 macrophages to CRP (r=0.6); HIF-1α to DAS28 (r=0.77), CRP (r=0.73); and VEGF to DAS28 (r=0.753) and RAMRIS (r=0.663). All patients showed a reduction of the DAS28 after 6 months (mean±SD: 5.2±1.5 vs. 2.75±1.1; p<0.05). There were three patients with a good EULAR response, and only these showed declining sublining CD68 macrophages in the control biopsy (χ2 test: LR 8.3, p=0.05). Two of the remaining patients with increasing CD68 sublining macrophages showed a deterioration of the RAMRIS. CONCLUSIONS: Some histological findings in arthroscopically-guided biopsies of the dominantly affected MCP joint reflect global disease activity measures and their changes in RA patients. Moreover, repeated MCP synovial biopsy may distinguish true responders from individuals with residual disease activity, who are not readily recognized by clinical means.
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