Table 1.
Patients’ characteristics
| Characteristic | Number |
| Total number | 105 |
| Median age (range) | 63 (45–83) years |
| Sex | |
| Male/female | 78/27 (74.3%/25.7%) |
| Neoplasm histotype | |
| Squamous cell carcinoma | 46 (43.8%) |
| Adenocarcinoma | 42 (40.0%) |
| Others | 17 (16.2%) |
| T stage | |
| T1 | 22 (20.9%) |
| T2 | 59 (56.2%) |
| T3 | 19 (18.1%) |
| T4 | 5 (4.8%) |
| N stage | |
| N0 | 43 (41.0%) |
| N1 | 40 (38.1%) |
| N2 | 22 (20.9%) |
| Clinical stage | |
| I | 45 (42.9%) |
| II | 33 (21.4%) |
| III (A and B) | 27 (25.7%) |
| Grade | |
| 1–2 | 45 (42.8%) |
| 3 | 60 (57.2%) |
| Postoperative radiotherapy | |
| Yes | 25 (23.8%) |
| No | 80 (76.2%) |
| Postoperative chemotherapy | |
| Yes | 31 (29.5%) |
| No | 74 (70.5%) |