Clinical characteristics of the lung adenocarcinoma patients
| Total patients | Age ≤50 years | Age >50 years | p-value | |
| Subjects | 1039 | 161 (15.5) | 878 (84.5) | |
| Age years | 65.4 (26.8–95.5) | 43.8 (26.8–49.9) | 68.2 (50.1–95.5) | |
| Sex | 0.908 | |||
| Female | 540 | 83 (51.6) | 457 (52.1) | |
| Male | 499 | 78 (48.4) | 421 (47.9) | |
| Smoking history# | 0.136 | |||
| Never-smoker | 742 | 118 (73.3) | 624 (71.2) | |
| Ex-smoker | 130 | 13 (8.1) | 117 (13.4) | |
| Current smoker | 165 | 30 (18.6) | 135 (15.4) | |
| ECOG PS | <0.001 | |||
| 0–1 | 887 | 154 (95.7) | 733 (83.5) | |
| 2–4 | 152 | 7 (4.3) | 145 (16.5) | |
| Stage at initial diagnosis | 0.328 | |||
| I | 118 | 14 (8.7) | 104 (11.8) | |
| II | 45 | 7 (4.3) | 38 (4.3) | |
| III | 106 | 22 (13.7) | 84 (9.6) | |
| IV | 770 | 118 (73.3) | 652 (74.3) |
Data are presented as n, n (%) or median (range), unless otherwise stated. ECOG PS: Eastern Cooperative Oncology Group performance status. #: data missing from two patients.