PRB2 and autoimmune polyendocrinopathy: Assessing all aPL antibodies detected by ELISA and MLDA, only anti-PI IgM (3/10), anti-PS IgM (5/10), and anti-CL IgM (7/10) antibodies detected by the MLDA demonstrated a significant higher prevalence in the APS patients suffering from TIAs compared with the remaining APS patients (0/75, P = 0.001215; 12/75, P = 0.024165; 26/75, P = 0.041781; respectively).