TNFSF13B and myeloid sarcoma: Serum BAFF levels were found to be increased in some patients suffering from systemic lupus erythematosus, primary Sjögren’s syndrome, rheumatoid arthritis, immune thrombocytopenia, systemic sclerosis, myeloperoxidase-autoantibody associated renal vasculitis, myasthenia gravis, Graves’ disease, anti-glomerular basement membrane antibody disease, or MS [9–18].