Table 1 Clinicopatholigical characteristics of the two cohorts of patients
Training cohort ( n =319) | Validation cohort ( n =164) | |||
|---|---|---|---|---|
Characteristics | Patient no./mean±s.d. | % | Patient no./mean±s.d. | % |
Gender | ||||
Male | 240 | 75.2 | 57 | 34.8 |
Female | 79 | 24.8 | 107 | 65.2 |
Age (years) | 55.9±9.4 | 57.0±7.3 | ||
Tumour location | ||||
Upper third | 48 | 15.0 | 26 | 15.9 |
Middle third | 151 | 47.3 | 81 | 49.4 |
Lower third | 120 | 37.6 | 57 | 34.8 |
Surgical approaches | ||||
Left thoracotomy | 117 | 63.3 | 114 | 69.5 |
Ivor–Lewis | 0 | 0 | 11 | 6.7 |
Cervico–thoraco–abdominal | 98 | 30.7 | 39 | 23.8 |
Tumour length (cm) | 4.3±1.8 | 4.8±2.2 | ||
Histological differentiation | ||||
G1 | 81 | 25.4 | 26 | 15.9 |
G2 | 165 | 51.7 | 108 | 65.9 |
G3 | 73 | 22.9 | 30 | 18.3 |
Pathological T category | ||||
T1 | 29 | 9.1 | 9 | 5.5 |
T2 | 113 | 35.4 | 9 | 5.5 |
T3 | 175 | 54.9 | 139 | 84.8 |
T4 | 2 | 0.6 | 7 | 4.3 |
Pathological N category | ||||
N0 | 217 | 68.0 | 120 | 73.2 |
N1 | 71 | 22.3 | 26 | 15.9 |
N2 | 26 | 8.2 | 14 | 8.5 |
N3 | 5 | 1.6 | 4 | 2.4 |
AJCC stage | ||||
I | 110 | 34.5 | 15 | 9.1 |
II | 130 | 40.8 | 101 | 61.6 |
III | 79 | 24.8 | 48 | 29.3 |
Risk of distant organ metastasis | ||||
High | 94 | 29.5 | 76 | 46.3 |
Low | 225 | 70.5 | 88 | 53.7 |
Total | 319 | 100 | 164 | 100 |
