MYCN and neuroblastoma: Haug et al. reported that MYCN-regulated miR-92a/b and let-7e can target the 3′ UTR of DKK3 and confirmed their ability to inhibit DKK3 transcription through luciferase reporter experiments; in NB cells, miR-92 also regulates the secretion of DKK3 (Haug et al., 2011).