YBX1 and nasopharyngeal carcinoma: Among NPC and the non-cancerous nasopharyngeal epithelia tissues included in this study, 39.3% (161/410) and 1.9% (1/53) demonstrated positive expression of YB1 in NPC and non-cancerous nasopharyngeal epithelia tissues respectively, and there was a significant difference between NPC and the non-cancerous nasopharyngeal epithelia tissues in the expression of YB1 (P < 0.001).