Subsequent research also confirmed that both miR-302 (Wang et al., 2019) and miR-299-3p (Liu et al., 2020) bind to the complementary sequences of the MAP3K2-3′-UTR, and thereby inhibit cell proliferation by downregulating MAP3K2 in HepG2/SMMC-7721 hepatocellular carcinoma and lung squamous cell carcinoma, respectively. This evidence concerns the gene MAP3K2 and squamous cell lung carcinoma.