FCGR2A/FCGR3A has been reported to be a susceptibility gene for other autoimmune diseases, such as systemic lupus erythematosus [21, 22], rheumatoid arthritis [23], multiple sclerosis [24], type 1 diabetes [23] and ulcerative colitis [25, 26]. The gene discussed is FCGR3A; the disease is type 1 diabetes mellitus.