MTHFR and Arterial thrombosis: In this group of patients, a statistically significant correlation was found between anti-PS/PT and anti-CL/Vim (p = 0.01), between positivity for aCL (by TLC-immunostaining) and mutation of MTHFR in heterozygosis (p = 0.026) and finally between arterial thrombosis and premature births (p = 0.039).