These studies have confirmed an association between carbamazepine-induced SJS/TEN with HLA-B*1502 allele among Han Chinese [27], carbamazepine and HLA-A*3101 and HLA-B*1511 [16], phenytoin and HLA-B*1502 [28], allopurinol and HLA-B*5801 [29]. This evidence concerns the gene HLA-B and toxic epidermal necrolysis.