Classification of Lung Cancer
| Classification | Description |
|---|---|
| Tumor | |
| Tx | Primary tumor not assessable |
| T0 | No evidence of primary tumor |
| T IS | Carcinoma in situ |
| T1 | Tumor ≤ 3 cm |
| T1 MIN | Minimally invasive adenocarcinoma |
| T1a | Tumor ≤ 1 cm |
| T1b | Tumor > 1 cm but ≤ 2 cm |
| T1c | Tumor > 2 cm but ≤ 3 cm |
| T2 | Tumor > 3 cm to ≤ 5 cm or tumor of any size that invades visceral pleura, involves main bronchus but not carina, shows atelectasis or obstructive pneumonitis that extends to hilum and involving part of lung |
| T2a | Tumor > 3 cm to 4 cm |
| T2b | Tumor > 4 cm to 5 cm |
| T3 | Tumor > 5 cm to 7 cm or tumor of any size that directly invades chest wall, pericardium, or phrenic nerve or shows one or more nodules in same lung lobe as primary tumor |
| T4 | Tumor > 7 cm or tumor of any size that invades mediastinum, diaphragm, heart, trachea, esophagus, or vertebral body or shows one or more nodules in another lobe of lung on ipsilateral side |
| Node | |
| Nx | Regional lymph nodes not assessable |
| N0 | No regional lymph node metastasis |
| N1 | Metastasis in ipsilateral peribronchial or hilar nodes and intrapulmonary nodes |
| N2 | Metastasis in ipsilateral mediastinal or subcarinal nodes |
| N3 | Metastases in contralateral mediastinal or hilar lymph nodes or in ipsilateral/contralateral scalene/supraclavicular lymph nodes |
| Metastasis | |
| M0 | No distant metastasis |
| M1 | Distant metastasis |
| M1a | Separate tumor nodules in contralateral lobe; tumor with pleural or pericardial nodules or malignant pleural or pericardial effusion |
| M1b | Single extrathoracic metastasis in single organ |
| M1c | Multiple extrathoracic metastases in one or several organs |
Modified from IASLC 8th edition Lung Cancer Staging, 2016.