FCGR3A and autoimmune thrombocytopenic purpura: The FCGR3A F158V (rs396991) polymorphism demonstrated a statistically significant association with ITP susceptibility in the overall population analysis, across all four genetic models tested: dominant (OR = 2.67, 95% CI 1.94–3.67, P < 0.001, FV + VV vs. FF), recessive (OR = 2.38, 95% CI 1.78–3.19, P < 0.001, VV vs. FF + FV), overdominant (OR = 1.58, 95% CI 1.15-2.17, P = 0.005, FV vs. FF + VV).