However, some studies have shown that AAV and RA share the same genetic features, such as protein tyrosine phosphatase non-receptor type 22 (PTPN22), polymorphism in uteroglobin, and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB2) [3]. This evidence concerns the gene SCGB1A1 and rheumatoid arthritis.