MYCN and neoplasm: As the tumour-suppressor function of mir-34a and -34c in MNA neuroblastoma is well documented (Welch et al, 2007; Cole et al, 2008; Wei et al, 2008; Tivnan et al, 2011), we selected the remaining eight experimentally validated MYCN-targeting miRNAs (mir-19a, -19b, -29a, -29b, -29c, -101, -202 and let-7e) for further functional analyses.