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| 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 | |
