Anticardiolipin antibodies and giant cell arteritis: a prospective, multicenter case-control study. Groupe de Recherche sur l'Artérite à Cellules Géantes

Arthritis and Rheumatism
P DuhautJ Pasquier

Abstract

To assess the prevalence and thrombogenic role of anticardiolipin antibodies (aCL) in giant cell arteritis. Two hundred eighty-four patients with newly diagnosed temporal arteritis or polymyalgia rheumatica and 210 age- and sex-matched controls randomly selected from the general population were included in a multicenter, prospective case-control study. Blood samples were obtained at the time of diagnosis, data on initial clinical features were collected in a questionnaire, and temporal artery biopsy findings were reviewed by an experienced pathologist. Anticardiolipin antibodies were present in 20.7% of patients compared with 2.9% of controls (P = 1.45 x 10(-9)). The prevalence of aCL was higher in samples found positive for temporal arteritis than in those found negative on biopsy (31.2% versus 16.7%; P = 0.04), and was similarly higher in the biopsy-positive temporal arteritis group compared with the polymyalgia rheumatica and control groups. Although aCL were associated with thrombotic complications in univariate analysis, the positivity of the biopsy findings remained the only predictive variable in stratified analysis. In giant cell arteritis, aCL seem to function as reactive antibodies in relation to endothelial lesions.

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