HLA-A and toxic epidermal necrolysis: There were 4 studies studying an association between HLA-A*2402 and CM-induced SJS/TEN with SOC in Japanese, Brazilian, Indian and Thai populations.13,22–24 The numbers of subjects carrying at least one allele of HLA-A*2402 were 80 out of 262 in cases and 451 out of 981 in controls.