We have previously demonstrated that OCTN1 suppresses proliferation and promotes differentiation of mouse neuroblastoma Neuro2a cells, which exhibit some characteristics of neuronal progenitor cells, i.e. are determined to differentiate into neuron and do not have pluripotentiality [27], but no information is available on possible expression and function of OCTN1 in NPCs. Here, SLC22A4 is linked to neuroblastoma.