MKI67 and nasopharyngeal carcinoma: High Ki67 expression was correlated with adverse prognosis of OS (HR = 3.155, 95% CI 1.489–6.683, P = 0.003), DFS (HR = 1.734, 95% CI 1.119–2.695, P = 0.014), and DMFS (HR = 1.974, 95% CI 1.190–3.274, P = 0.008) in NPC, but did not significantly increase LRFS risk (HR = 1.266, 95%CI 0.587–2.728, P = 0.547).