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  • Title: Comparison of five assays for immune complexes in the rheumatic diseases. An assessment of their validity for rheumatoid arthritis.
    Author: McDougal JS, Hubbard M, McDuffie FC, Strobel PL, Smith SJ, Bass N, Goldman JA, Hartman S, Myerson G, Miller S, Morales R, Wilson CH.
    Journal: Arthritis Rheum; 1982 Oct; 25(10):1156-66. PubMed ID: 6753850.
    Abstract:
    Clinical assessment (disease activity, severity, and extraarticular manifestations) of 101 rheumatoid arthritis patients was correlated with several laboratory tests, including 5 immune complex assays: the bovine conglutinin, 125I-Clq binding, monoclonal rheumatoid factor inhibition, Raji cell, and staphylococci binding assays. Elevated disease activity indices were most closely associated with the presence of immune complexes detected by the 125I-Clq and staphylococci binding assays. There were significant but weak correlations between the level of disease activity and the level of immune complexes as measured by the bovine conglutinin, 125I-Clq binding, Raji cell, and staphylococci binding assays. Articular disease severity, as measured by anatomic stage, was discriminated by the bovine conglutinin, monoclonal rheumatoid factor inhibition, and staphylococci binding assays. Extraarticular manifestations were best discriminated by the Raji cell and staphylococci binding assays. We concluded that the sensitivity, specificity, predictive value, and overlap of the associations were not sufficient to warrant their wide use for the diagnosis and management of rheumatoid arthritis in individual patients. Conversely, the 125I-Clq and staphylococci binding assays were as good as the erythrocyte sedimentation rate and the IgG rheumatoid factor test (the 2 best of many examined) in assessing disease activity. Further prospective studies with these assays will determine their usefulness in following rheumatoid arthritis for a prolonged period.
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