As expected, NB5t primary cells showed increased expression of mesenchymal genes (NT5E, ENG, ACTA2, MME, CD44, VIM or ALPL) [13, 18, 21, 22], while NB5t tumor sample expressed mostly neuronal genes (TH, ENO2, NCAM1, DDC or CHGB) [23–27] reflecting the neuroblastic phenotype of stage 4/M NB tumors. Here, CD44 is linked to neoplasm.