In unconditioned analysis, DPB1*04:02 was nominally associated with the susceptibility of ACPA(+)RA (P = 0.0021, Pc = 0.0275, odds ratio [OR] 1.52, 95% confidence interval [CI] 1.16–1.99, Table 2, left column). This evidence concerns the gene HLA-DPB1 and rheumatoid arthritis.