LGR4 and hepatocellular carcinoma: Western blot analysis revealed that LGR4 expression significantly decreased with decreasing level of Circ_0003945 (Figure 5A and Figure S5G), and the suppressed LGR4 level in Circ_00039450‐knockdown HCC cells was promoted by miR‐34c‐5p inhibition (Figure 5B and Figure S5H).