Here, we generated a panel of cell lines at different stages of NB transformation, including normal NCCs, NCCs with N‐Myc overexpression, p53−/− and p53+/− mixed NCCs (p53mixed NCCs), and tumor‐derived cell lines (TDCL) from an NB tumor caused by N‐Myc overexpression in wild‐type NCCs (N‐Myc Tu), and TDCLs from three independent tumors caused by N‐Myc overexpression in p53mixed NCCs (N‐Myc; p53mixed Tu) [29]. This evidence concerns the gene MYCN and neoplasm.