Takahashi et al. reported that cross-reaction of the platelet membrane glycoprotein (GP) IIb/IIIa, GP Ib/IX, GP Ia/IIa, and GP VI, the antigen corresponding to antiplatelet autoantibodies, with the H. pylori constituent protein CagA caused thrombocytopenia [22]. This evidence concerns the gene ITGA2B and Thrombocytopenia.