BRD4 and cancer: Although the role of BRD4 as a transcriptional activator has been mainly attributed to the long isoform (BRD4L) (Drumond‐Bock & Bieniasz, 2021), recent evidence demonstrated that BRD4S promotes the formation of phase‐separated transcriptional foci, which sustain gene expression and cancer cell proliferation (Han et al, 2020).