High expression of Mash1 was significantly associated with advanced tumor stage (p = 0.004) but not with age (p = 0.81), TrkA expression (p = 0.4), MYCN copy number (p = 0.11), tumor origin (p = 0.2) and Shimada classification (p = 0.45) (Table S1). This evidence concerns the gene MYCN and neoplasm.