Severe drug‐induced hypersensitivity syndrome with a shared HLA‐B allele

We describe the first reported cases of phenytoin-related drug-induced hypersensitivity syndrome in unrelated Indigenous Australians with the same HLA-B*56:02 allele. These patients shared common clinical and pathological features, and all three were found to have the otherwise rare HLA-B allele, which might represent a novel genetic susceptibility factor for this syndrome.