Table 1.

Clinical data of patients enrolled.

	Clinicopathological data	Case (n)	Ratio (%)
Age (years old)	>60	50	41.7
	≤60	70	58.3
Gender	Male	81	67.5
	Female	39	32.5
Pathological type	Squamous carcinoma	63	52.5
	Adenocarcinoma	57	47.5
Clinical stage	Stage I	38	31.7
	Stage II	34	28.3
	Stage III	47	39.2
	Stage IV	1	0.08