In addition to myelin antigens, MS patients have been shown to produce autoantibodies to various neuronal antigens such as neurofascin (NF-186), neurofilament light chain (NF-L), and to glial antigens such as KIR4.1 and glial fibrillary acidic protein (GFAP) [18–21]. Here, GFAP is linked to myeloid sarcoma.