HLA-DRB1*14:02 is associated with a broad ACPA response. Serum levels of antibodies targeting RA-associated Cit-autoantigens were measured in serum from 232 INA patients with RA using a custom bead-based fluorescence immunoassay. Fluorescence intensities for 10 Cit-autoantigens and CCP were clustered (A) according to the presence or absence of 1 or 2 HLA-DR-SE alleles or HLA-DRB1*14:02 with any HLA-DR-SE allele, and (B) according to presence or absence of a single HLA-DR-SE or HLA-DRB1*14:02 allele, as shown. Each column represents one patient sample. ACPA, anticitrullinated peptide antibody; CCP, cyclic citrullinated peptide; Cit, citrullinated; RA, rheumatoid arthritis; SE, susceptibility epitope.