Table 1.

Clinicopathologic parameters of patients.

Clinicopathologic parameter	N (total = 51)
Median age	67.06 ± 12.10
Sex
Male	30
Female	21
Smoking
Never	39
Ever	12
Stage IV	51
Distant metastasis	25
Brain	15
Bone	5
Live	2
More than two distant organs	3
EGFR mutation	20
Anticancer therapy
No	8
Intrapleural injection of cisplatin	8
Systemic chemotherapy	15
EGFR-TKIS	20