Human endogenous retrovirus W family (HERV-W), originally discovered in multiple sclerosis (MS) patients and designated as MS-associated retrovirus (MSRV) [5], draws the attention of most researchers for its putative roles in several diseases, including autoimmune diseases [6], neuropsychological diseases [7], and cancers [8,9,10]. Here, SKIC2 is linked to myeloid sarcoma.