For instance, HLA-B*1502 and HLA-A*3101 are predictive markers for carbamazepine (CMZ)-induced SJS/TEN respectively in Asians [4,5] and Europeans [6], while HLA-B*5801 for allopurinol-induced SJS/TEN in both populations [7,8]. The gene discussed is HLA-A; the disease is toxic epidermal necrolysis.