Version June 2024
| Primary tumor (T) | |||
| TX | Primary tumor cannot be assessed | ||
| T0 | No evidence of primary tumor | ||
| T1 | Tumor limited to the ipsilateral parietal pleura with or without mediastinal pleura and with or without diaphragmatic pleural involvement | ||
| T1a | No involvement of the visceral pleura | ||
| T1b | Tumor also involving the visceral pleura | ||
| T2 | Tumor involving each of the ipsilateral pleural surface (parietal, mediastinal, diaphragmatic, and visceral pleura) with at least one of the following: | ||
| Involvement of diaphragmatic muscle | |||
| Extension of tumor from visceral pleura into the underlying pulmonary parenchyma | |||
| T3 | Locally advanced but potentially resectable tumor | ||
| Tumor involving all of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic, and visceral pleura) with at least one of the following: | |||
| Involvement of the endothoracic fascia | |||
| Extension into the mediastinal fat | |||
| Solitary, completely resectable focus of tumor extending into the soft tissues of the chest wall | |||
| Nontransmural involvement of the pericardium | |||
| T4 | Locally advanced technically unresectable tumor | ||
| Tumor involving all of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic, and visceral pleura) with at least one of the following: | |||
| Diffuse extension or multifocal masses of tumor in the chest wall, with or without associated rib destruction | |||
| Direct transdiaphragmatic extension of tumor to the peritoneum | |||
| Direct extension of tumor to the contralateral pleura | |||
| Direct extension of tumor to mediastinal organs | |||
| Direct extension of tumor into the spine | |||
| Tumor extending through to the internal surface of the pericardium with or without a pericardial effusion or tumor involving the myocardium | |||
| Regional lymph nodes (N) | |||
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastases | ||
| N1 | Metastases in the ipsilateral bronchopulmonary or hilar lymph nodes | ||
| N2 | Metastases in the subcarinal or the ipsilateral mediastinal lymph nodes including the ipsilateral internal mammary and peridiaphragmatic nodes | ||
| N3 | Metastases in the contralateral mediastinal, contralateral internal mammary, ipsilateral or contralateral supraclavicular lymph nodes | ||
| Distant metastasis (M) | |||
| M0 | No distant metastasis | ||
| MI | Distant metastasis present | ||
| Anatomic stage/prognostic groups | |||
| Stage I | T1 | N0 | M0 |
| Stage IA | T1a | N0 | M0 |
| Stage IB | T1b | N0 | M0 |
| Stage II | T2 | N0 | M0 |
| Stage III | T1, T2 | N1 | M0 |
| T1, T2 | N2 | M0 | |
| T3 | N0, N1, N2 | M0 | |
| Stage IV | T4 | Any N | M0 |
| Any T | N3 | M0 | |
| Any T | Any N | M1 | |
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