CUX1 and breast cancer: One study revealed that FGF1 is transcriptionally regulated by CUX1 in the Hs578T human breast cancer cell line and in the Bon‐1 human pancreatic neuroendocrine tumour cell line.15, 21 In this study, we explored whether CUX1 is involved in the DPPA‐mediated FGF1 inhibition.