Polo-like kinase 1 (PLK1) and Lysine (K)-specific demethylase 4B (KDM4B), both of which have been reported to be highly expressed in OC cells and trigger cancer development [9, 10], were found as mRNA targets of miR-545 according to the data on a bioinformatic system StarBase (http://starbase.sysu.edu.cn/). The gene discussed is PLK1; the disease is cancer.