Hep-2 and TU212 cells were transfected with si-NC or si-circ. Cells were collected at 48 h after transfection. (A,B) qRT-PCR analysis of hsa_circ_0023028 expression in Hep-2 and TU212 cells. (C,D) CCK-8 assay showed the viability of Hep-2 and TU212 cells transfected with si-NC or si-circ. CCK-8 (E,F) and EdU (G,H) proliferation assay showed the cell proliferation ability of Hep-2 and TU212 cells transfected with si-NC or si-circ. **P<0.01 and ***P<0.001.