Table 2.
American Joint Cancer Commission 2010 TNM classification.
| T (primary tumor) | |
| Tx | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| T1 | Tumor invades lamina propria or submucosa and size ≤2 cm |
| T1a | Tumor size <1 cm in greatest dimension |
| T1b | Tumor size 1–2 cm in greatest dimension |
| T2 | Tumor invades muscularis propria or size >2 cm with invasion of lamina propria or submucosa |
| T3 | Tumor invades through muscular propria into subserosa or into nonperitonealized pericolic or perirectal tissue |
| T4 | Tumor invades peritoneum or other organs |
| N (Regional Lymph nodes) | |
| Nx | Regional lymph nodes cannot be assessed |
| N1 | No regional lymph node metastases |
| N2 | Regional lymph node metastases |
| M (Distant metastases) | |
| M0 | No distant metastases |
| M1 | Distant metastases |
| Stage | |
| I | T1N0M0 |
| IIA | T2N0M0 |
| IIB | T3N0M0 |
| IIIA | T4N0M0 |
| IIIB | AnyTN1M0 |
| IV | AnyTAnyNM1 |