Genetic study of 16 pts w/ Allopurinol-induced severe cutaneous adverse Rxn (SJS/TEN) shows 2 class I alleles to be associated: HLA-B*58:01 (OR, 28.0 [95% CI, 8.6-100.6]) and HLA-A*34:02 (OR, 20.6 [95% CI, 3.3-131.1]). Both explain 80% risk in US pts https://t.co/OxDXuWCbup https://t.co/oky61JImQV