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 | / |