An example is the let-7 family in lung cancer (30), which inhibits various oncogenes such as Rat Sarcoma (RAS), Myelocytomatosis Viral Oncogene Homolog (MYC), and High Mobility Group AT-hook 2 (HMGA2), thereby reducing the expression of cell cycle proteins (31–35). This evidence concerns the gene HMGA2 and lung cancer.