MYCN and medulloblastoma: Ly6E mRNA expression was significantly higher in medulloblastoma with CTNNB1 mutation (n=8) than CTNNB1 wildtype tumors (n=38), medulloblastoma with CTNNB1 positive by immunohistochemistry (IHC) (n=6) than CTNNB1 IHC negative (n=44), tumors with MycN amplification (n=14) than tumors not amplified for MycN (n=32) in Kool [107], Robinson [108] and Janoueix-Lerosey [109] studies.