MYCN and neoplasm: Interrogation of a previous SNP array (Affymetrix Cytoscan 750K array) conducted on this patient sample for clinical care revealed that MYCN amplification and the major chromosomal losses (1p, 10q) and gains (1q, 2p, 13q and 17q), were all present in a tumour population that comprised 50% of cells (Supplementary Fig. S1A, C).