For the PAD2/PADI2 analysis, the rs2076615-AC and rs1005753-TG heterozygous genotypes are associated with decreased PAD2 levels in the RA-ILD group vs. RA group (p < 0.05), the figures are shown in the supplementary material in Figure S2 and serum levels depending on genotypes are included in the Supplementary Table S4. This evidence concerns the gene PADI2 and rheumatoid arthritis.