One patient, who showed Glanzmann thrombasthenia-like marked reduction in surface αIIbβ3 expression (3–11% of normal control), was a compound heterozygote with ITGA2B p.Gly991Cys and a novel nonsense mutation, ITGA2B p.Arg422*. This evidence concerns the gene ITGA2B and Glanzmann thrombasthenia 1.