MPO and myeloid sarcoma: The concentrations of neutrophil-activated chemokines and neutrophil-derived enzymes in the blood of MS patients were higher than those in control, and these molecules were related to the formation of new inflammatory lesions, and these included CXC chemokine ligand-1 (CXCL1), CXCL8, and myeloperoxidase (MPO) [13].