Table 1. Patient characteristics.

	IGF-R expression
Characteristic	Low	High	P
Age			0.417
<65	23	37
≥65	23	27
Gender			0.002
Male	33	60
Female	13	4
Cell differentiation			0.569
Well	2	3
Moderate	42	53
Poor	2	6
Tumor location			0.267
Upper	7	4
Middle	26	37
Lower	13	23
T stage			0.446
T1	6	4
T2	14	19
T3	26	41
Lymph node metastasis			0.24
No	33	39
Yes	13	25
TNM			0.665
I	6	5
II	31	41
III	8	16
IV	1	2
Tumor diameter(cm)Mean ± SD	3.6 ± 1.72	4.0 ± 1.44	0.184
OS(months)Mean ± SD	46.46 ± 20.046	30.89 ± 18.750	0.000