To further investigate whether miR‐455‐5p or miR‐491‐5p could inhibit the expression of E2F2 gene in ovarian cancer cells, we transfected the SKOV3 and OVCAR‐3 cells with miR‐455‐5p mimic, miR‐491‐5p mimic or miRNA mimic negative control, after which we compared the protein levels of E2F2 in these cells. The gene discussed is E2F2; the disease is ovarian carcinoma.