BRD4 and cancer: Small‐molecule inhibitors targeting chromatin signaling pathways (“epi‐drugs”) are intensely studied as potential therapeutics against cancer and other diseases.[8] Considerable efforts have focused on the Bromodomain and Extra‐Terminal (BET) family of proteins, which regulate gene transcription and chromatin organization.[9] In mammals this family comprises four proteins (Brd2, Brd3, Brd4 and Brdt), of which the best studied is Brd4.