DDR1 and hepatocellular carcinoma: In human HCC tissues, the expression of miR-199a-5p decreases, and DDR1 increases. In HepG2 and SNU182 cell lines, DDR1 expression was significantly higher than in primary human hepatocytes. Transfection of miR-199a-5p that acts directly on DDR1 could inhibit the invasion of HepG2