In addition, according to previous studies, most circRNAs have been found to have the same functions as their host genes and play synergistic roles in tumors, of which some of them are highly expressed in tumor tissues and can promote the expression of the host genes through a variety of mechanisms, thus to promote tumor proliferation, migration, invasion, stemness, drug resistance and radiation resistance of tumor cells as oncogenes, such as circ-EGFR [21], circ-ENO1 [22] and circ-Amotl1 [23, 24]. This evidence concerns the gene ENO1 and neoplasm.