DPP4 and colorectal carcinoma: In addition, four cytokeratin genes (KRT8, KRT16, KRT17, and KRT19) and eight tumor-associated genes (TERT, MUC16/M17S2/CA125, CD44, TWIST1, TACSTD1/EpCAM/CD326/ESA/HEA125/GA733, DPP4/CD26, ESR1, and PGR), were upregulated in CRC and breast cancer samples, as described previously [9].