ReviewRisk of venous and arterial thrombosis according to type of antiphospholipid antibodies in adults without systemic lupus erythematosus: A systematic review and meta-analysis
Introduction
Antiphospholipid antibodies (APLs) have been described as risk factors for venous or arterial thrombosis [1]. In systemic lupus erythematosus (SLE) patients, the prevalence of lupus anticoagulant (LA) and anticardiolipin (aCL) antibodies varies from 11 to 30% and from 17 to 39%, respectively [2]. At 20 years of follow-up, LA-positive SLE patients have a 50% higher risk of venous or arterial thrombosis [3]. Concerning this autoimmune disease, the impact of APL detection on therapy has not been clearly established, but many authors advise prophylactic aspirin [4], [5]. In patients without SLE, the estimated prevalence of APL ranges from 1 to 5.6% according to one review, [3] suggesting that even in this population, the risk of a first thrombosis could be sufficiently high to warrant specific therapeutic management for APL-positive patients. Quantification of the risk of venous and arterial thrombosis associated with APL is therefore particularly important. Several studies have tried to evaluate the association of APL with venous thrombotic events, especially that of LA and aCL, in patients without SLE. A meta-analysis published in 1998 concluded that the risk of venous thrombosis was increased 10-fold in LA-positive patients and by 50% in aCL-positive patients [6]. However, this meta-analysis deserves updating to include all the studies performed since 1998 and more recently identified APLs. During the last 20 years, better understanding of the pathogenic mechanisms of antiphospholipid antibody syndrome (APS) has led to the identification of several new APLs and the development of specific tests for their detection. These new APLs are directed against plasma proteins bound to particular anionic surfaces and do not recognize anionic phospholipids in the same way as aCL [7], [8]. They include anti-β2 Glycoprotein I (β2GpI), identified in 1990, anti-prothrombin (aPT), anti-phosphatidyl serine (aPS) and anti-phosphatidyl ethanolamine (aPE) [9], [10], [11], [12], [13], [14]. Patients with thrombosis may be positive for these antibodies, mainly in the absence of LA and aCL [15], [16]. The clinical significance of their presence is still debated, as the clinical relevance of immunoglobulin (Ig) APL isotypes (IgG, IgM and IgA) [17].
Previous studies have evaluated the association between APL and risk of arterial thrombosis, but no meta-analysis has estimated this risk.
We therefore conducted a meta-analysis to estimate the risk of both venous and arterial thrombosis associated with APLs, including new APLs, in adults without SLE.
Section snippets
Material and methods
We followed the Meta-Analysis of Observational Studies in Epidemiology guidelines during all stages of design, implementation, and reporting of this meta-analysis [18]. We identified all relevant published and unpublished observational studies that specifically examined the association between APL (exposure) and venous or arterial thrombosis (outcome) in patients without SLE (study population). Selection criteria were determined before data collection.
Study selection
We identified 80 eligible studies that specifically investigated the risk of thrombosis related to APLs (Fig. 1). Six studies were excluded on the basis of their titles or abstracts according to the selection criteria. Forty-four studies were excluded for three major reasons: SLE population, APS, and no available data. Finally, 30 studies were included: 28 case-control [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41],
Discussion
The aim of this meta-analysis was to assess the relationship between APLs, especially the more recently identified autoantibodies, and cardiovascular events. Our results for venous thrombosis corroborate and reinforce those of Wahl [6], the risk of this event being increased six-fold in LA-positive patients compared to LA-negative patients, with a trend towards a 50% increase in risk in aCL-positive patients compared to aCL-negative patients. Considering the studies in which controls were
Take-home messages
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In asymptomatic patients, LA and aCL are associated with an increased risk of venous thrombosis, contrary to aPT and β2GpI. The prognostic value of aPS and aPE needs to be assessed by further studies for venous thrombosis.
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Classical (LA, aCL, and β2GpI) and new (aPT and aPS) autoantibodies are predictive of arterial thrombosis. No data are avalaible for aPE.
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Our data are insufficient to systematically advice a primary prevention by aspirin or thromboprophylaxis with low-molecular-weight heparin
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