The Effect of Gefitinib on Treatment Necessity and Prognosis of NSCLC Patients with Early EGFR Mutations

Table 3

Comparison between EGFR mutation types and metastatic sites.

EGFR mutation type	Lung metastasis	Liver metastasis	Bone metastasis	Brain metastasis
Exon 19 deletion	2 (9.09)	2 (9.09)	15 (68.18)	3 (13.64)	18.504	0.005
Exon 20 T790M	5 (20.00)	2 (8.00)	4 (16.00)	14 (56.00)
Exon 21 L858	0 (0.00)	1 (33.33)	2 (66.67)	0 (0.00)