Table 1. Baseline data of all patients.

Clinical features	N [21]
Gender
Men	13
Women	8
Age
<65 years	12
≥65 years	9
Pathologic type
Adenoma	13
Squamous cell carcinoma	7
Non-small cell lung cancer - not otherwise specified	1
Previous chemotherapy
≤2 lines	10
>2 lines	11
EGFR gene
Wild-type	7
Mutant	3
Central nervous system metastasis
Yes	3
No	18