Table I.
Clinicopathological characteristics of 571 consecutively diagnosed young age lung cancer patients.
| Parameter | Patients, n (%) |
|---|---|
| Age at diagnosis, years | |
| Mean (SD) | 39.1 (5.1) |
| Range | 17.0–44.0 |
| Gender | |
| Female | 309 (54.1) |
| Male | 262 (45.9) |
| Pathological cell type | |
| Adenocarcinoma | 278 (48.7) |
| Squmaous | 52 (9.1) |
| Small cell | 34 (6.0) |
| Carcinoid | 76 (13.3) |
| Other | 131 (22.9) |
| Tumor stage | |
| I | 85 (14.9) |
| II | 35 (6.1) |
| III | 147 (25.7) |
| IV | 251 (44.0) |
| Limited (small cell)a | 16 (2.8) |
| Extensive (small cell)b | 17 (3.0) |
| Unknown | 20 (3.5) |
| Tumor grade | |
| Well differentiated | 65 (11.4) |
| Moderate differentiated | 141 (24.7) |
| Poor/undifferentiated | 191 (33.4) |
| Ungradeablec | 174 (30.5) |
| Smoking status | |
| Never-smoker | 197 (34.4) |
| Former-smoker | 118 (20.7) |
| Current-smoker | 251 (44.0) |
| Unknown | 5 (0.9) |
a
Tumors confined to the hemithorax.
b
Tumors found outside of the hemithorax.
c
Grading was not possible due to insufficient tissue samples. Tumors were staged according to the American Joint Committee on Cancer 2010 Cancer Staging Manual (19). SD, standard deviation.