BRD4 and nut midline carcinoma: Recurrent gene fusions that characterize distinct subtypes of cancers include BRD4-NUT in NUT midline carcinoma, ETV6-NTRK3 in secretory breast carcinoma, CRTC-MAML2 fusions in mucoepidermoid carcinoma, and RAF family fusions in pilocytic astrocytomas.