HLA-B and toxic epidermal necrolysis: When we compared the frequency of HLA-B*13:01 allele of seven Asian patients with dapsone-induced SJS-TEN and dapsone-tolerant control Thais and the general Thai population, HLA-B*13:01 allele was strongly associated with dapsone-induced SJS-TEN among Asians compared to the dapsone-tolerant control Thais (OR: 54.00; 95% CI: 5.12–569.39 and Pc-value = 2.7599 × 10−3) and general Thai population (OR: 46.22; 95% CI: 5.46–391.26 and Pc-value = 4.3858 × 10−4) respectively (Table 4).