Table 1.
Patient clinicopathological characteristics
| Variable | Overall patients (n = 2102) | N0 patients (n = 736) |
|---|---|---|
| Sex | ||
| Male | 1593 | 564 |
| Female | 509 | 172 |
| Age, mean (SD) | 63.8, (11.2) | 63.5, (11.4) |
| BMI, mean (SD) | 21.5, (3.3) | 21.3, (3.1) |
| Operation Time, mean (SD) | 201, (64) | 196, (67) |
| Tumor Size, mean (SD) | 4.9, (1.9) | 4.6, (2.1) |
| Tumor Location | ||
| upper third | 697 | 218 |
| middle third | 467 | 126 |
| lower third | 938 | 392 |
| Tumor differentiation | ||
| well differentiated | 682 | 211 |
| moderately differentiated | 720 | 317 |
| poorly differentiated or undifferentiated | 700 | 208 |
| Lymphovascular invasion | ||
| Yes | 498 | 96 |
| No | 1604 | 640 |
| T-stage | ||
| T1 | 459 | 356 |
| T2 | 240 | 123 |
| T3 | 504 | 117 |
| T4 | 899 | 109 |
| N-stage | ||
| N0 | 736 | / |
| N1 | 301 | / |
| N2 | 354 | / |
| N3 | 711 | / |
| AJCC stage | ||
| Ia | 378 | 387 |
| Ib | 171 | 123 |
| IIa | 187 | 117 |
| IIb | 253 | 109 |
| IIIa | 228 | / |
| IIIb | 344 | / |
| IIIc | 532 | / |