“…Other identifiable risk factors (such as malignancy and use of central venous catheters) were reported in only three patients [36,59,63], all associated with venous thrombosis. For all but four patients (5%) [36,43,54,57], no thromboprophylaxis was administered during the treatment cycle; in 12 (13%) patients, at least low-dose thromboprophylaxis was given when OHSS developed and while the patients were hospitalized [23,37,[41][42][43]53,59,[79][80][81]. In six patients [51,55,57,62,63,81] with venous thromboses and in one patient with arterial thrombosis [72], progression of thrombosis occurred despite administration of anticoagulation; the overall risk of progression is 7.5%.…”