Raf/MEK/ERK pathway plays an important role in cell growth, cell cycle and drug resistance, etc. It was verified that higher expression of circ_CDR1as could regulate MEK/ERK pathway via miR-1287/Raf1 axis, and then played positive roles in proliferation, migration, invasion, and EMT in HCC cells [76]. This evidence concerns the gene MAP2K7 and hepatocellular carcinoma.