Multiple correspondence discriminant analysis revealed two dimensions: one comprised of the clinical activity variables of RA (SDAI CC, 0.258; DAS28VSG CC, 0.261; ESR CC, 0.087; and swollen joints CC, 0.218) and a second dimension in which the presence of antibodies against citrullinated peptides of P. gulae PAD (anti-LPQ-cit9/15 CC, 0.749; anti-LPQ-cit total CC, 0.749; anti-LPQ/VDK CC, 0.520; and anti-LPQ-cit 9 CC, 0.476) was related to each other. Here, PADI4 is linked to rheumatoid arthritis.