RET and neoplasm: CCDC6 has been identified as a negative regulator of CREB1 dependent transcription and tumours harboring the CCDC6-RET oncogene or occurring in Ccdc6-ex2 knock-in mice exhibit an enhanced phosphorylation and activity of CREB1 with a consequent increased expression of Amphiregulin (AREG) one of the known ligand for the EGFR family [100, 119, 120].