The present study reveals that allopurinol is the leading cause of TEN/SJS in many countries. In contrast to carbamazepine, which is ethnic/population specific, the HLA-B*5801 for detecting allopurinol-induced TEN/SJS is universal. Screening of HLA-B*5801 may help patients to prevent the occurrence of allopurinol-induced TEN/SJS, especially in populations with a higher (≥ 5%) risk allele frequency.
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