PLAGL2 and hepatocellular carcinoma: To confirm the regulatory relationship between miR‐378a‐3p and its target, PLAGL2, or β‐catenin in human HCC clinical tissue specimens, the expression of miR‐378a‐3p and PLAGL2/β‐catenin in HCC TMA (90 cases) was analyzed by ISH and IHC, respectively.