The data of TCGA (The Cancer Genome Atlas) database not only showed the same relationship between AP4 and LAPTM4B in mRNA level (Fig. S6A), but also suggested that LAPTM4B expression was associated with tumour grade and high‐expression LAPTM4B was a poor prognostic marker in HCC patients (Fig. S6B). This evidence concerns the gene LAPTM4B and hepatocellular carcinoma.