SNAI2 and thyroid gland carcinoma: Among these 20 key genes, five genes TWIST1 (45), SNAI2 (46), TSHR (47), FOXE1 (48), and CD274 (PD-L1) (49) have been reported to be differentially expressed in ATC compared to normal thyroid samples and other thyroid cancer samples both at mRNA and protein expression levels.