ERVW-1 and myeloid sarcoma: Considering only RR-MS patients (Figure 1), results were almost the same as those previously described, with significantly higher pHERV-W ENV/syncytin-1 protein expression levels in RR-MS patients compared to HD (monocytes, p=2.83e-5; B lymphocytes, p =0.012; NK cells, p=1.35e-8).