Table 1 The clinical characteristics of patients from the Centers A and B
Parameters | Center A (n = 447) | Center B (n = 82) |
|---|---|---|
Median age (years; range) | 67 (42–85) | 66 (63–84) |
Gender (male: female) | 332:115 | 58:24 |
Anatomic distribution (%) | ||
 Upper thoracic portion | 49 (11.0) | 12 (14.6) |
 Middle thoracic portion | 285 (63.7) | 47 (57.3) |
 Lower thoracic portion | 113 (25.3) | 23 (28.1) |
Differentiation (%) | ||
 Well | 169 (37.8) | 30 (36.6) |
 Moderate | 227 (50.8) | 43 (52.4) |
 Poor | 51 (11.4) | 9 (11.0) |
T stage (%) | ||
 cT1 | 82 (18.4) | 14 (17.1) |
 cT2 | 123 (27.5) | 25 (30.5) |
 cT3 | 207 (46.3) | 36 (43.9) |
 cT4a | 35 (7.8) | 7 (8.5) |
N stage (%) | ||
 cN0 | 263 (58.9) | 41 (50.0) |
 cN1 | 128 (28.6) | 24 (29.3) |
 cN2 | 56 (12.5) | 17 (20.7) |
Survival data | ||
 Postoperative therapy (%) | ||
  Yes | 108 (24.2) | 20 (24.4) |
  No | 339 (75.8) | 62 (75.6) |
 Disease-free survival within one year, months (mean ± SD) | 11.22 ± 2.39 | 10.32 ± 3.67 |
 Recurrence or death (%) | ||
  Yes | 100 (22.4) | 22 (26.8) |
  No | 347 (77.6) | 60 (73.2) |