More recently, studies in the Han Chinese population have involved the HLA-B locus with very strong drug-specific associations: the HLA-B*1502 allele was found in all carbamazepine-induced SJS/TEN patients [14] and the HLA-B*5801 in all allopurinol-induced SJS/TEN patients [15]. This evidence concerns the gene HLA-B and Schwartz-Jampel syndrome.