MYCN and neuroblastoma: To investigate the clinical implications of DDX21 and CEP55 in MYCN‐amplified neuroblastoma, we examined DDX21 and CEP55 expression in 88 and 493 human neuroblastoma tissues in the publicly available Affymetrix microarray Versteeg dataset and RNAseq SEQC‐RPM‐seqcnb1 dataset downloaded from the R2 platform (http://r2.amc.nl) on July 7, 2017, and April 6, 2018, respectively [32, 33].