DPP4 and hepatocellular carcinoma: (119) found that circ MET (circ 0082002) was upregulated in HCC tumors, and that circ MET overexpression facilitated HCC invasion, metastasis and immune suppression through the miR-30-5p/Snail/dipeptidyl peptidase 4 (DPP4)/CXCL10 axis.