Primary tumor (T) | |||
T1 | Tumor ≤3 cm diameter, surrounded by lung or visceral pleura, without invasion more proximal than lobar bronchus* | ||
T1a | Tumor ≤2 cm in diameter | ||
T1b | Tumor >2 cm but ≤3 cm in diameter | ||
T2 | Tumor >3 cm but ≤7 cm, or tumor with any of the following features: | ||
Involves main bronchus, ≥2 cm distal to carina | |||
Invades visceral pleura | |||
Associated with atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung | |||
T2a | Tumor >3 cm but ≤5 cm | ||
T2b | Tumor >5 cm but ≤7 cm | ||
T3 | Tumor >7 cm or any of the following: | ||
Directly invades any of the following: chest wall, diaphragm, phrenic nerve, mediastinal pleura, parietal pericardium, main bronchus <2 cm from carina (without involvement of carina) | |||
Atelectasis or obstructive pneumonitis of the entire lung | |||
Separate tumor nodules in the same lobe | |||
T4 | Tumor of any size that invades the mediastinum, heart, great vessels, trachea, recurrent laryngeal nerve, esophagus, vertebral body, carina, or with separate tumor nodules in a different ipsilateral lobe | ||
Regional lymph nodes (N) | |||
N0 | No regional lymph node metastases | ||
N1 | Metastasis in ipsilateral peribronchial and/or ipsilateral hilar lymph nodes and intrapulmonary nodes, including involvement by direct extension | ||
N2 | Metastasis in ipsilateral mediastinal and/or subcarinal lymph node(s) | ||
N3 | Metastasis in contralateral mediastinal, contralateral hilar, ipsilateral or contralateral scalene, or supraclavicular lymph node(s) | ||
Distant metastasis (M) | |||
M0 | No distant metastasis | ||
M1 | Distant metastasis | ||
M1a | Separate tumor nodule(s) in a contralateral lobe; tumor with pleural nodules or malignant pleural or pericardial effusion | ||
M1b | Distant metastasis (in extrathoracic organs) | ||
Stage groupings | |||
Stage IA | T1a-T1b | N0 | M0 |
Stage IB | T2a | N0 | M0 |
Stage IIA | T1a,T1b,T2a | N1 | M0 |
T2b | N0 | M0 | |
Stage IIB | T2b | N1 | M0 |
T3 | N0 | M0 | |
Stage IIIA | T1a,T1b,T2a,T2b | N2 | M0 |
T3 | N1,N2 | M0 | |
T4 | N0,N1 | M0 | |
Stage IIIB | T4 | N2 | M0 |
Any T | N3 | M0 | |
Stage IV | Any T | Any N | M1a or M1b |
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