In the ferroptosis‐sensitive TCCSUP xenograft group, the ferroptosis inducer erastin significantly reduced the volume and weight of the xenograft tumours compared with those in control mice (p < 0.05), whereas DDR1 overexpression evidently increased the tumour size and weight caused by erastin (p < 0.05), and the tumour size and weight were reduced by HOXA6 knockdown (Figure 6A). This evidence concerns the gene DDR1 and neoplasm.