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Comparison of the sixth and the seventh TNM staging systems for the pT and pN stages
| Tumor localization | 6th TNM staging system | 7th TNM staging system |
| Lamina propria or muscularis mucosa | T1 | T1a |
| Submukoza | T1 | T1b |
| Muscularis propria | T2a | T2 |
| Subseroza | T2b | T3 |
| Serozal invasion | T3 | T4a |
| Adjacent organ invasion | T4 | T4b |
| 1-2 lymp node metastasis | N1 | N1 |
| 3-6 lymp node metastasis | N1 | N2 |
| 7-15 lymp node metastasis | N2 | N3a |
| ≥ 16 lymp node metastasis | N3 | N3b |
