Table I.
Characteristics of study population.
| Characteristic | Subjects with pre-invasive squamous endobronchial lesions | Patients diagnosed with invasive lung SqCC | Cancer-free,healthy individuals |
|---|---|---|---|
| Gender, male:female | 14:6 | 9:7 | 11:5 |
| Age (years), median (range) | 62 (46–71) | 63 (50–81) | 56 (28–87) |
| COPD, yes:no:unknown | 10:9:1 | 11:4:1 | 5:9:2 |
| Smoking status, C:F:N | 8:12:0 | 7:8:0a | 2:4:9a |
| No. of pack years, median (range) | 40 (22–120) | 40 (15–60)a | 39 (20–46)a,b |
a
Data were not available for 1 SqCC patient and 1 healthy control subject;
b
never-smokers were not taken into account. SqCC, squamous cell carcinoma; COPD, chronic obstructive pulmonary disease; C, current smoker; F, former smoker; N, never smoker.