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Summary of proposed tumor node metastasis staging system
| Proposed TNM stage for colon cancer | TN combinations | Proposed TNM stage for rectal cancer | TN combinations |
| I | T1N0-1a | I | T1N0-1a |
| II | T1N1b-2a | II | T1N1b-2a |
| T2N0-1b | T2N0-1b | ||
| T3N0 | T3N0 | ||
| IIIa | T1N2b | IIIa | T1N2b |
| T2N2a-2b | T2N2a-2b | ||
| T3N1a-2a | T3N1a-2a | ||
| T4aN0-1a | T4aN0-1a | ||
| T4bN0 | |||
| IIIb | T3N2b | IIIb | T3N2b |
| T4aN1b-2b | T4aN1b-2b | ||
| T4bN1a-1b | T4bN0-1b | ||
| IIIc | T4bN2a-2b | IIIc | T4bN2a-2b |
TNM: Tumor node metastasis.
