| Training cohort | Validation cohort | ||||||
---|---|---|---|---|---|---|---|---|
Cases | Low | High | P c | Cases | Low | High | P c | |
Gender | ||||||||
 Male | 91 | 45 | 46 | 0.9391 | 110 | 52 | 58 | 0.4255 |
 Female | 104 | 52 | 52 |  | 79 | 42 | 37 |  |
Age | ||||||||
 ≤ 69a/66b | 100 | 55 | 45 | 0.133 | 100 | 45 | 55 | 0.1687 |
 > 69a/66b | 95 | 42 | 53 |  | 89 | 49 | 40 |  |
Tumor location | ||||||||
 Distal | 150 | 82 | 68 | *0.0123 | 121 | 55 | 66 | 0.1174 |
 Proximal | 45 | 15 | 30 |  | 68 | 39 | 29 |  |
Histological type | ||||||||
 Well/moderate | 175 | 90 | 85 | 0.0566 | 180 | 90 | 90 | 0.7456 |
 Poor | 18 | 5 | 13 |  | 9 | 4 | 5 |  |
 Unknown | 2 | – | – |  | – | – | – |  |
Pathological T category | ||||||||
 pT1-3 | 48 | 34 | 14 | **0.0008 | 154 | 82 | 72 | *0.0434 |
 pT4 | 147 | 63 | 84 |  | 35 | 12 | 23 |  |
Lymph node metastasis | ||||||||
 Negative | 132 | 73 | 59 | *0.025 | 85 | 53 | 32 | **0.0025 |
 Positive | 63 | 24 | 39 |  | 100 | 40 | 60 |  |
 Unknown | – | – | – |  | 4 | – | – |  |
Distant metastasis | ||||||||
 Negative | 187 | 96 | 91 | *0.0319 | 143 | 80 | 63 | **0.0027 |
 Positive | 8 | 1 | 7 |  | 46 | 14 | 32 |  |
Stage | ||||||||
 I | 29 | 21 | 8 | **0.006 | 28 | 18 | 10 | **0.0052 |
 II | 99 | 51 | 48 |  | 53 | 33 | 20 |  |
 III | 59 | 24 | 35 |  | 62 | 29 | 33 |  |
 IV | 8 | 1 | 7 |  | 46 | 14 | 32 |  |