“…. In addition, the association between aPL and IS or TIAs is strong1, [8][9][10][11][12][13][14][15]17,18,[28][29][30][31][32][33][34] if the exact pathophysiology of aPL-induced thrombosis is still unknown35, there is an urgent need for controlled prospective studies dealing with primary and secondary prevention of thrombosis in APS 12,16,[20][21][22][23][36][37][38][39][40][41][42][43][44][45][46] In situ thrombosis in veins or medium to large arteries, proliferative small vessel vasculopathy as well as embolism from cardiac valvular lesions have been reported iñ jpgi2,i6 Thus, thrombotic APS is an heterogenous syndrome in which either venous or arterial thromboembolic events are observed~'~'~~. Interestingly, 91% of Rosove's patients and 87.5% of our APS patients had repetitive thrombotic events of similar distribution when untreated.…”