In breast cancer cells, through analyzing the public available ChIP‐seq dataset,[25] we found that the chromatin at the POU4F1 promoter in BLBC cell lines was characterized by the increased binding of H3K4me3 and H3K27ac, representing POU4F1 promoter was open for active transcription in BLBC (Figure 7G). Here, POU4F1 is linked to breast carcinoma.