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  • Title: Anti-C1q affinity isolated circulating immune complexes correlate with extra-articular rheumatoid disease.
    Author: Melsom RD, Horsfall AC, Schrieber L, Charles P, Maini RN.
    Journal: Rheumatol Int; 1986; 6(5):227-31. PubMed ID: 3492027.
    Abstract:
    Circulating immune complexes (CIC) were isolated from sera of 35 patients with rheumatoid arthritis (RA) by a two-step method using 2% polyethylene glycol precipitation and anti-C1q affinity chromatography. By this method CIC were exclusive to 19 patients with vasculitis, nodules, or Sjögren's syndrome. Levels of CIC did not correlate with the severity of synovitis but reflected the extent of extra-articular disease. Furthermore, in four patients with persistent severe synovitis observed over a period of 4 to 16 months, the levels of CIC paralleled changes in extra-articular disease. Despite such additional evidence, whether the relationship between CIC and tissue injury is causative or consequential remains unresolved.
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