Table 1.
Clinicopathologic features of patients involved in this study
| Characteristics | Total n=577 (%) | |
|---|---|---|
|
| ||
| Age (years) | ≤60 | 297 (51.5) |
| >60 | 280 (48.5) | |
| Sex | Female | 167 (28.9) |
| Male | 410 (71.1) | |
| Smoking | Yes | 339 (58.8) |
| No | 238 (41.2) | |
| Cell types | Adenocarcinoma | 331 (57.4) |
| Squamous | 193 (33.4) | |
| Others | 53 (9.2) | |
| Tumor differentiation | Well or moderately | 347 (60.1) |
| Poorly or undifferentiated | 230 (39.9) | |
| Visceral pleura invasion | Yes | 225 (39.0) |
| No | 352 (61.0) | |
| Bronchial invasion | Yes | 149 (25.8) |
| No | 428 (74.2) | |
| Postoperative chemotherapy | Yes | 94 (16.3) |
| No | 483 (83.7) | |
| Resected lymph node numbers | <12 | 255 (44.2) |
| ≥12 | 322 (55.8) | |
| Resected lymph node stations | <6 | 413 (71.6) |
| ≥6 | 164 (28.4) | |