Patients taking heparin who experienced arterial thrombosis (n = 16) had similar levels of HLA-G compared to the other patients (n = 28) (4.55 (0–15.2) versus 3.2 (0–22.9) ng/mL, P = 0.557, Mann-Whitney test), and patients taking heparin who experienced venous thrombosis (n = 18) had comparable levels of HLA-G compared to the others (n = 26) (3.6 (0–22.9) versus 3.35 (0–15.9) ng/mL, P = 0.990, Mann-Whitney test). This evidence concerns the gene HLA-G and Venous thrombosis.