Over 20 genes are associated with CH, such as TSHR, TTF-1/NKX2-1, PAX-8, TTF-2/NKX2-5, FOXE1, DUOX2, DUOXA2, TG, TPO, SLC5A5/NIS, SLC26A4/PDS, and IYD [11]. This evidence concerns the gene SLC5A5 and cyclic hematopoiesis.