FASLG and systemic lupus erythematosus: The annual incidence of thrombosis in patients with positive aPL antibodies but without history of thrombosis or obstetric manifestations is different between the reported studies, ranging from 0, in patients without associated disorders [6], to 1.3–2.8/100 patients-year, in studies that mix healthy population with SLE and other autoimmune diseases [7, 8].