We treated HCCLM6 cells and HCC1664 cells (patient‐derived primary HCC cell) expressing the IL‐17A receptor with exogenous IL‐17A (50 ng·mL−1) for 2 weeks (Fig. S2A), which caused the cells to undergo EMT, as indicated by a spindle ‐shaped appearance (Figs 2A and S2B). This evidence concerns the gene IL17A and hepatocellular carcinoma.