MYCN and ependymoma: A limited set of RNA sequencing data (n = 2) and gene expression profiles generated on the Affymetrix U133 Plus2.0 array (n = 1) allowed comparison of MYCN expression levels with a cohort of spinal ependymal tumors (n = 18) comprising molecular subgroups SP-MPE (n = 8) and SP-EPN (n = 10) as well as to a cohort representing all intracranial molecular subgroups of ependymoma (n = 32) (Fig. 3a, b).