HIF1A and neoplasm: As shown in our data, the tumour formation and growth in HIF‐1α KO fibroblasts‐injected group were significantly lower than that in HIF‐1α MOCK fibroblasts‐injected one, and the tumour volume and weight in the experimental mice were significantly smaller than those in the control group, while the mice weights had no obvious difference between two groups (Figure 4B‐D).