Table 1. Patients characteristics and EGFR mutation status.

Variables	No.	EGFR status wt / mut (%)	P-value
Age (y)
≤70	44	28 / 16 (63.6% / 36.4%)	0.59
>70	39	27 / 12 (69.2% / 30.8%)
Smoking history
Never smoker	15	4 / 11 (26.7% / 73.3%)	<0.0003
Smokers	68	51 / 17 (75.0% / 25.0%)
≤30 pack-years (15)		5 / 10 (33.3% / 66.7%)
>30 pack-years (48)		41 / 7 (85.4% / 14.6%)
unknown (5)		5 / 0 (100% / 0%)
Disease stage
Stage I	52 (45*)	35 / 17 (67.3% / 32.7%)	0.96
Stage II	20 (13*)	13 / 7 (65.0% / 35.0%)
Stage III	11 (10*)	7/ 4 (63.6% / 36.4%)

^* indicates the number of smoker patients.