In addition, most of these studies carried out lupus anticoagulant assays, and only a few of them analysed IgA anti-β2GPI; it should also be borne in mind that all these patients, as well as those included in our study, received prophylactic treatment with LMWH, which probably results in a lower occurrence of TEE [13,15,16,17,20]. Here, APOH is linked to systemic lupus erythematosus.