Downstream target gene IGF2BP1 of let-7c-5p is proved to be widely expressed in embryos and tumor tissues, to play an important role in controlling embryonic development (Pillas et al., 2010), and to serve as a carcinogen in most cancers including liver cancer (Jiang et al., 2017), glioblastomas (Wang et al., 2015), and gastric cancer (Gu et al., 2015). The gene discussed is IGF2BP1; the disease is neoplasm.