Numerous cytokines including granulocyte-macrophage colony-stimulating factor (GM-CSF), IFNβ, IFNγ, TNFa, IL-2, IL-6, IL-10, IL-12, IL-17, IL-21, IL-22, IL-23, and others are actively involved in the pathogenesis of MS [22,23]. Here, IL17A is linked to myeloid sarcoma.