E2F2 and ovarian carcinoma: Notably, we found that LBX2‐AS1 knockdown could also down‐regulate the protein level of E2F2 in the two ovarian cancer cell lines, which could be abrogated by cotransfection with miR‐455‐5p or miR‐491‐5p inhibitor, as suggested by our Western blot assay results in Figure 4E, suggesting that LBX2‐AS1 could assist the expression of E2F2 gene by inhibiting miR‐455‐5p or miR‐491‐5p.