Table 1. Summary of demographic information.

Clinical characteristics	Case	EGFR expression			EGFR FISHa
		0~2+	3+	P value	Negative	Positive	P value
Age (year)
<=65	149	76	73	0.907	109	40	0.138
>65	44	22	22		37	7
Gender
Male	165	88	77	0.085	126	39	0.574
Female	28	10	18		20	8
Histologic grade
G1	20	10	10	0.421	14	6	0.737b
G2	80	45	35		60	20
G3	93	43	50		72	21
Clinical stage
I	7	6	1	0.045b	6	1	0.146b
II	30	16	14		24	6
III	81	46	35		66	15
IV	75	30	45		50	25
Lymph node metastasis
No	32	22	10	0.026	27	5	0.208
Yes	161	76	85		119	42

^aFluorescence In Situ Hybridization

^bTested by Fisher's exact test