TABLE 2.

Patient and clinicopathological characteristics.

Characteristics	Types	Sample numbers
Gender
	Female	275
	Male	237
Age (years)
	>60	338
	≤60	155
Tumor invasion
	T1	169
	T2	276
	T3	46
	T4	19
	Tx	2
Lymph node metastasis
	N0	330
	N1	95
	N2	74
	N3	2
	Nx	10
	Not reported	1
Metastasis
	M0	345
	M1	25
	Mx	138
	Not reported	4
TNM stage
	Stage I	274
	Stage II	122
	Stage III	83
	Stage IV	25
	Not reported	8
Radiation_therapy
	No	369
	Yes	57
	Not reported	86