Clinical and pathologic characteristics of patients and their tumors
| No. of patients | 89 |
| Mean age (y) | 65.5 |
| Male/female ratio | 71/18 |
| Smoking/nonsmoking ratio | 60/29 |
| Surgical procedure | |
| PE/diagnostic thoracotomy | 6 (6.8%) |
| Segment resection | 5 (5.5%) |
| Lobectomy | 64 (72%) |
| Bilobectomy | 2 (2.2%) |
| Pneumonectomy | 12 (13.5%) |
| Histology | |
| Squamous cell carcinoma | 49 (55%) |
| Adenocarcinoma | 40 (45%) |
| Tumor-node-metastasis staging | |
| I | 31 (34.8%) |
| II | 23 (25.8%) |
| III | 29 (32.6%) |
| IV | 6 (6.8%) |
| Grading | |
| Well/moderately well differentiated | 25 (28%) |
| Poorly differentiated/undifferentiated | 64 (72%) |
| Residual tumor situation | |
| R0 | 75 (84.2%) |
| R1 | 6 (6.8%) |
| R2 | 8 (9%) |
| No. of patients | 89 |
| Mean age (y) | 65.5 |
| Male/female ratio | 71/18 |
| Smoking/nonsmoking ratio | 60/29 |
| Surgical procedure | |
| PE/diagnostic thoracotomy | 6 (6.8%) |
| Segment resection | 5 (5.5%) |
| Lobectomy | 64 (72%) |
| Bilobectomy | 2 (2.2%) |
| Pneumonectomy | 12 (13.5%) |
| Histology | |
| Squamous cell carcinoma | 49 (55%) |
| Adenocarcinoma | 40 (45%) |
| Tumor-node-metastasis staging | |
| I | 31 (34.8%) |
| II | 23 (25.8%) |
| III | 29 (32.6%) |
| IV | 6 (6.8%) |
| Grading | |
| Well/moderately well differentiated | 25 (28%) |
| Poorly differentiated/undifferentiated | 64 (72%) |
| Residual tumor situation | |
| R0 | 75 (84.2%) |
| R1 | 6 (6.8%) |
| R2 | 8 (9%) |