| TNM classification | Modified Dukes's classification | Survival (%) |
| Stage 0—Carcinoma in situ | ||
| Stage I—No nodal involvement, no metastases; tumour invades submucosa (T1, N0, M0); tumour invades muscularis propria (T2, N0, M0) | A | 90-100 |
| Stage II—No nodal involvement, no metastases; tumour invades into subserosa (T3, N0, M0); tumour invades other organs (T4, N0, M0) | B | 75-85 |
| Stage III—Regional lymph nodes involved (any T, N1, M0) | C | 30-40 |
| Stage IV—Distant metastases | D | <5 |
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