Clinical features of NPC patients participated in this study.

a: NPC patients involved in this study.b: M, male; F, female.c: WHO histopathological classification of NPC (2005), A: keratinizing squamous cell carcinoma; B1: differentiated non-keratinizing carcinoma; B2: undifferentiated non-keratinizing carcinoma; C: Basaloid squamous cell carcinoma.d: The TNM clinical classification for NPC according to AJCC staging, 7th Edition. T-Primary tumor; N-Regional lymph nodes; M-Distant metastasis.Clinical features of NPC patients participated in this study.