FOXP3 and Autoimmunity: Among non-HLA candidate genes, variants of regulatory pathways (e.g., nuclear factor (NF)-kB) and factors related to immune response (e.g., transcription factors forkhead box P3 (FOXP3), BTB domain and CNC homolog 2 (BACH2), and ribonuclease T2 (RNASET2)) are shared by different autoimmune disorders, including MS and AITDs [13,14].