The ITLN1 and NDRG2 transcript levels in NB tissues were positively correlated (correlation coefficient R = 0.291, P = 0.0059, Additional file 1: Figure S1C), and were inversely associated with the international neuroblastoma staging system (INSS) stages (Additional file 1: Figure S1D). Here, NDRG2 is linked to neuroblastoma.