ITGA2B and Glanzmann thrombasthenia 1: Glanzmann thrombasthenia (GT) is an autosomal platelet function disorder caused by a quantitative or qualitative defect of the platelet membrane glycoprotein IIb–IIIa (integrin αIIbβ3) complex.1, 2With a prevalence of 1:1 million, GT is rare, although the prevalence is higher in areas where marriage between relatives is common.