However, sequencing-based HLA-B typing identified this patient to have HLA-B*15:21, which is a member of the HLA-B75 serotype and shares structural similarity and peptide-binding specificities with HLA-B*15:02, reported to be associated with carbamazepine-induced SJS/TEN (Jaruthamsophon et al., 2017). The gene discussed is HLA-B; the disease is toxic epidermal necrolysis.