NDRG1 and nasopharyngeal carcinoma: Multivariate Cox regression analysis showed that TNM stage [hazard ratio (HR), 2.151; P value, 0.001], seRNA-NPCM levels (HR, 1.866; P value, 0.034), and NDRG1 expression (HR, 3.314; P value, 0.015) were independent prognostic factors for NPC patients (Supplementary Data 7).