These SNPs are common with PADI4 haplotype 4 and haplotype 2/3, whereas padi4_104C→T, padi4_95G→C, and padi4_96T→C, which are common with PADI4 haplotype 4 and haplotype 1, exhibited no association with RA. Here, PADI4 is linked to rheumatoid arthritis.