Table 17. Smoking status differences in EGFR gene mutation types.

Gene mutation types	Smoker			Non- smoker		P value
	Cases	Mutation rate (%)		Cases	Mutation rate (%)
Exon 19	12	54.55		13	48.15	0.8742
Exon 20	5	22.72		7	25.93	0.9402
Exon 21	7	31.82		12	44.44	0.5435
Amplification	8	36.36		5	18.52	0.2792