After endogenous CSDE1 was immunoprecipitated in HA‐Ub‐transfected HepG2 or SK‐HEP‐1 cells, evidently increased ubiquitination levels of CSDE1 protein were observed in the stable ARHGAP5‐AS1‐KD HCC compared to controls (Figure 4J). This evidence concerns the gene PTGDR and hepatocellular carcinoma.