FCGR2A and autoimmune thrombocytopenic purpura: No statistically significant differences in genotype distributions were observed between ITP cases and controls for either FCGR2A (HH: 17.5%, HR: 62.5%, RR: 20.0%) or FCGR3A (FF: 25.0%, FV: 55.0%, VV: 20.0%) (p > 0.05).