Table 2.
Comparison of clinicopathological features between patients with and without lymph node metastasis
| Factors | Node negative | Node positive | P value |
| Dissected nodes (mean ± SD) | 19.3 ± 7.5 | 20.8 ± 6.9 | 0.188 |
| Age, yr (mean ± SD) | 53.9 ± 12.1 | 52.9 ± 13.2 | 0.606 |
| Tumor maximum diameter (cm, mean ± SD) | 3.1 ± 1.8 | 3.5 ± 1.8 | 0.197 |
| Gender | |||
| Male | 209 | 33 | |
| Female | 66 | 14 | 0.465 |
| Tumor location | |||
| Upper | 11 | 0 | |
| Middle | 53 | 9 | |
| Lower | 207 | 38 | 0.435 |
| Total | 4 | 0 | |
| Depth of invasion | |||
| Mucosa | 143 | 9 | |
| Submucosa | 132 | 38 | < 0.001 |
| Histological type | |||
| Differentiated | 130 | 12 | |
| Undifferentiated | 145 | 35 | 0.007 |
| Macroscopic type | |||
| Protruded | 18 | 3 | |
| Flat | 34 | 4 | 0.746 |
| Depressed | 223 | 40 | |
| Growth manner | |||
| Mass | 87 | 15 | |
| Nest | 79 | 12 | 0.891 |
| Diffuse | 109 | 20 | |
| lymphatic invasion | |||
| Negative | 267 | 36 | |
| Positive | 8 | 11 | < 0.001 |
Differentiated: Papillary and tubular adenocarcinoma; Undifferentiated: Poorly differentiated adenocarcinoma and signet-ring cell carcinoma; Protruded:IandIIa; flat: IIb; depressed:IIc and III.