ZEB1 and lung carcinoma: Expression patterns in CircNet, an online circular RNA regulatory prediction tool, indicated that four identified circRNAs: circ-ZEB1.5, circ-ZEB1.19, circZEB-1.17, and circ-ZEB1.33 were down-regulated in human lung cancer specimens compared to the normal lung tissue samples, and all four circRNAs have the potential to sponge the miR-200 [4].