HLA antigens in immunologic thrombocytopenic purpura (ITP)

79 patients with definite ITP were investigated for HLA-A, -B, -C antigens. There was an increased frequencey of HLA-B5 in the entire groups (27.8% vs. 16.5% in controls and for HLA-B12 in male patients. However, after correction for the number of antigens tested, the difference of antigen frequencies became insignificant.