PSIP1 and Venous thrombosis: We thus retrospectively compared the aPTT measured in the absence of any therapeutic anticoagulant treatments of (1) patients with anti-DFS70 antibodies that had experienced thrombosis (n = 42) with those of (2) healthy anti-DFS70 antibodies carriers (n = 17) and of (3) patients that experienced thrombosis without anti-DFS70 antibodies (n = 46).