DPP4 and thyroid cancer: In addition, the high expression levels of the DPP4/CTNNB1/MET correlate positively (all p < 0.001, cor > 0.3) with the infiltration levels of tumor-associated macrophages (M2 TAM Figure 5B), regulatory T cell (Treg, Figure 5C), and cancer-associated fibroblast (CAF, Figure 5D) in thyroid cancer cohorts (Figure 5).