FCGR3B and systemic lupus erythematosus: Deletions of FCGR3B have previously been associated with the susceptibility to numerous autoimmune diseases: glomerulonephritis,192 SLE,34, 115, 121, 159, 170, 185, 196, 198 ulcerative colitis,101 rheumatoid arthritis (RA),114, 116, 199, 200, 201 ankylosing spondylitis,119 systemic sclerosis,117 primary Sjögren syndrome,118, 200 microscopic polyangiitis, and Wegener's granulomatosis.121