Other genetic variations intensively studied regarding their association with autoimmune diseases, in particular, SLE, were the R620W polymorphism of the protein tyrosine phosphatase non-receptor type 22 gene (PTPN22), MYO9B, and CLEC16A (chromosomal position 16p13) [39,40,41]. This evidence concerns the gene PTPN22 and systemic lupus erythematosus.