HLA-B and ankylosing spondylitis: We found that 5.3% Taiwanese were carriers of HLA-B*27:04, a risk factor for ankylosing spondylitis, and 4.1% of our population had HLA-B*15:02, known to be associated with carbamazepine-induced Stevens–Johnson syndrome (Table 5 and Supplementary Table 6)35,36.