Table 1.
Baseline characteristics of the patients
| Characteristics | No. (%) |
|---|---|
| Age at diagnosis, years | |
| Mean ± S.D† | 58.8 ± 7.1 |
| Median (range) | 58 (44–70) |
| Sex, n (%) | |
| Male | 38 (80.9) |
| Female | 9 (19.1) |
| History of smoking, n (%) | |
| Former or current | 33 (70.2) |
| Never | 14 (29.8) |
| Site of primary tumor, n (%) | |
| Upper thoracic | 2 (4.3%) |
| Middle thoracic | 26 (55.3) |
| Lower thoracic | 19 (40.4) |
| Histologic grade, n (%) | |
| Well-differentiated | 5 (10.7) |
| Moderately differentiated | 30 (63.8) |
| Poorly differentiated | 12 (25.5) |
| Clinical T stage, n (%) | |
| T1 | 0 (0) |
| T2 | 12 (25.5) |
| T3 | 35 (74.5) |
| T4 | 0 (0) |
| Clinical N state, n (%) | |
| N0 | 3 (6.4) |
| N1 | 17 (36.2) |
| N2 | 27 (57.4) |
| Tumor stage‡, n (%) | |
| II | 11 (23.4) |
| III | 36 (76.6) |
| ECOG score, n (%) | |
| 0 | 41 (87.2) |
| 1 | 6 (12.8) |
†Standard deviation
‡Tumor stage was evaluated following the American Joint Committee on Cancer's (AJCC) Staging Manual, 7th edition; ECOG score, Eastern Cooperative Oncology Group (ECOG) performance status (PS) score