Anticytoplasmic autoantibodies in the diagnosis and follow-up of Wegener's granulomatosis - PubMed (original) (raw)
Anticytoplasmic autoantibodies in the diagnosis and follow-up of Wegener's granulomatosis
U Specks et al. Mayo Clin Proc. 1989 Jan.
Abstract
Sixty-five patients with biopsy-proven Wegener's granulomatosis (WG), 54 with systemic vasculitis, 22 with relapsing polychondritis, 20 with sarcoidosis, 20 with malignant pulmonary lesions, and 15 with other conditions underwent determination of anticytoplasmic autoantibodies (ACPA) by the indirect immunofluorescence technique on neutrophil cytospin preparations to assess the specificity of ACPA for WG, their sensitivity in relationship to the extent and activity of the disease, and their value for follow-up of WG. Of these 65 patients with WG, 38 were ACPA positive. Two patients in the vasculitis group, best categorized as having microscopic polyarteritis, were ACPA positive. We obtained 125 serum samples from the 65 patients with WG and assigned them to one of two categories (limited or generalized), based on the extent of disease. Each of these categories was then subdivided into "active" or "in remission." Median ACPA titers were significantly different between active disease and remission in each category, as well as between active limited and active generalized disease. All patients whose disease changed from active to in remission had reductions in ACPA titer levels; those who experienced flares had titer increases. Patients with intercurrent illnesses or complications of treatment, mimicking WG flares, did not have titer increases. We conclude that ACPA determined by the indirect immunofluorescence technique is highly specific for WG. The sensitivity is dependent on the extent and activity of WG, and serial titer determinations are valuable in monitoring disease activity.
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