The strongest association between HLA type and a drug causing SJS/TEN has been found between HLA-B*15:02 and CBZ in the Han-Chinese, Thai, and Malaysian populations (Chung et al., 2004; Tassaneeyakul et al., 2010; Chang et al., 2011; Tangamornsuksan et al., 2013), and HLA-B*58:01 and allopurinol in the Han-Chinese population (Hung et al., 2005b; Somkrua et al., 2011). The gene discussed is HLA-B; the disease is toxic epidermal necrolysis.