Table 1. Patient distribution according to different characteristics.

Characteristics		No. of patients (%)
Gender
	Male	234
	Female	92
Age (yr)
	≥54.5	210
	<54.5	116
Tumor differentiation
	Low	113
	Moderate–high	213
TNM stage
	Phase I	82
	Phase II	114
	Phase III	130
Lymph node metastases
	Yes	136
	No	190

TNM = tumor, node, and metastasis.