PTPN1 and neuroblastoma: Together, our findings suggest that PTPN1 high expression in NB tumors might not be necessary for NB cell transformation, but rather could arise as a surrogate marker of NB tumor evolution, and support the hypothesis that PTPN1 growth-modulatory activity in SH-SY5Y NB cells takes place upstream in tyrosine phosphorylation signaling pathways.