HLA-DRB1 and adult-onset Still disease: In Japanese populations, an association between a chronic articular form of AOSD and HLA-DRB1*1501 (DR2), DRB1*1201 (DR5), and DQB1*0602 (DQ1) was previously reported, while HLA- and DQB1*0602 (DQ1) have been also associated with the systemic form of the disease [8].