PTPN22 and Autoimmunity: In addition to T1DM, RA, SLE, JIA, and vasculitis, other autoimmune disorders such as autoimmune thyroid diseases (AITD), including Grave’s disease and Hashimoto’s disease, Addison’s disease, autoimmune thrombocytopenia, inflammatory bowel disease, vitiligo, etc., had a significant correlation with the PTPN22 1858T allele [38,66].