Table 1.

The clinicopathologic characteristics of specimens.

Specimens	Cases
NPE	131
Age (median 46.1 years) ≤ 48	66
> 48	65
Gender: male	95
female	36
NPC	256
Age (median 48.4 years) ≤ 48	125
> 48	131
Gender: male	200
female	56
Metastasis	164
No metastasis	92
Stages I	28
Stages II	87
Stages III	89
Stages IV	52

NPE: non-tumor nasopharyngeal epithelium; NPC: nasopharyngeal carcinoma.