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This article is part of the supplement: 23rd European Workshop for Rheumatology Research

Meeting abstract

Low frequency of phosphatidylserine/prothrombin complex antibodies in a cohort of patients with anticardiolipin antibodies and recent thrombosis

H Locht

  • Correspondence: H Locht

Author Affiliations

Department of Autoimmunology, Statens Serum Institut, Copenhagen, Denmark

Arthritis Res Ther 2003, 5(Suppl 1):11  doi:10.1186/ar641


The electronic version of this article is the complete one and can be found online at:


Published:24 February 2003

©

Objective

Clinical data from patients who were positive for anticardiolipin antibodies (ACAs), tested on a routine basis in an autoimmune laboratory, were obtained by questionnaires from the referring physicians. One hundred and sixty-two individuals had experienced a recent (within <6 months) thromboembolic event. All sera were tested for IgG and IgM antibodies against cardiolipin, β2-glycoprotein 1 (β2-glp 1), and the complex of phosphatidylserine/prothrombin (PPC) by in-house ELISA methods.

Results

Among the 162 ACA-positive patients, 31 (19%) were also positive for antibodies against PPC. In the group with ACA only, 73% of the patients had no pre-existing rheumatic condition, compared with 32% in the PPC group (P = 0.00002). Thirty-two percent in the PPC group had SLE, vs 12% in the ACA group (P = 0.016). The fractions of patients with deep venous thrombosis (DVT), pulmonary embolism (PE), or myocardial infarction (MI) were equal, whereas cerebrovascular incidents (CVI) were more frequent among ACA patients; 51% vs 26% (P = 0.02). Antibodies against β2-glp 1 were also more frequent in the PPC group 61% vs 30% (P = 0.002).

Conclusion

Antibodies against both ACA and PPC seem to define a subset of patients with autoimmune thrombophilia. More patients with PPC antibodies had SLE and also tested positive for antibodies against β2-glp 1. The distribution of thrombotic manifestations differed between the two populations in that CVI was more frequent in the ACA-only group, whereas the fractions with DVT, PE, and MI were equal.