BRD4 and cancer: Especially, the engagement of BRD4, a member of BET transcriptional coactivators, as well as the role for TRIM28—a transcriptional co‐repressor, known to mediate E3 SUMO/ubiquitin ligase activity, have been well established in mediating the self‐renewal properties of cancer stem cells.15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27