Table 1 Patient’s characteristics
|  | n = 36 |
|---|---|
Age | |
  ≥ 71 | 17 |
  ≤ 70 | 19 |
Sex | |
 Men | 27 |
 Women | 9 |
Smoking history | |
 Yes | 31 |
 No | 5 |
Performance status | |
 0–1 | 27 |
 2–4 | 9 |
Histological type | |
 Adenocarcinoma | 24 |
 Squamous cell | 3 |
 Small cell | 9 |
Disease stage | |
 IIIB | 5 |
 IV | 26 |
 Post-operative recurrence | 5 |
EGFR mutation | |
 Yes | 5 |
 No | 31 |
With pre-existing interstitial shadow | |
 Yes | 21 |
 No | 15 |
With emphysema | |
 Yes | 23 |
 No | 13 |