BRD4 and neoplasm: In case #2 and case #5 [4], the BRD4 component of the fusion transcript is longer (Table 1) but still does not include a positive transcription elongation factor b (P-TEFb) interaction domain, and the intrinsically disordered region (IDR) is shorter than in the long BRD4 isoform (BRD4-L); the latter being associated with tumor suppressor activity [25].