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M categories
| Tumors of the upper thoracic esophagus | |
| M1a | Metastasis in cervical nodes |
| M1b | Other distant metastasis |
| Tumors of the mid-thoracic esophagus | |
| M1a | Not applicable |
| M1b | Non-regional lymph nodes and/or other distant metastasis |
| Tumors of the lower thoracic esophagus | |
| M1a | Metastasis in celiac lymph nodes |
| M1b | Other distant metastasis |
