MYCN and neuroblastoma: For 12 MYCN-targeting miRNAs we observed significant inverse correlation to MYCN expression or activity and thus provide evidence that they regulate MYCN in a neuroblastoma tissue context: eight let-7 family miRNAs (let-7a-5p, let-7b-5p, let-7c-5p, let-7d-5p, let-7f-5p, let-7g-5p, let-7i-5p and miR-98), three miR-29 family miRNAs (miR-29a-3p, miR-29b-3p, miR-29c-3p) and miR-34a-5p.