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| Tumor size, cm | N | Lymph node metastasis, n (%) | Without lymph node metastasis, n (%) |
|---|---|---|---|
| 0–1 | 177 | 1 (0.56) | 176 (99.44) |
| 1–2 | 404 | 22 (5.45) | 382 (94.55) |
| 2–3 | 260 | 69 (26.54) | 191 (73.46) |
| χ2 | 97.006 | ||
| P | <0.01 | ||
