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Lung

Primary Tumor (T)
T Category	Stage Category Definitions
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
Tis	Carcinoma in situ
T1	Tumor ≦ 3 cm in greatest dimension, surrounded by lung or visceral pleura, without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus)*
T1a	Tumor ≦ 2 cm in greatest dimension
T1b	Tumor > 2 cm but ≦ 3 cm in greatest dimension
T2	Tumor > 3 cm but ≦ 7 cm or tumor with any of the following features (T2 tumors with these features are classified T2a if ≦ 5 cm) Involves main bronchus, ≧ 2 cm distal to the carina Invades visceral pleura (PL1 or PL2) 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 in greatest dimension
T2b	Tumor > 5 cm but ≦ 7 cm in greatest dimension
T3	Tumor > 7 cm or one that directly invades any of the following: parietal pleural (PL3) chest wall (including superior sulcus tumors), diaphragm, phrenic nerve, mediastinal pleura, parietal pericardium; or tumor in the main bronchus (< 2 cm distal to the carina* but without involvement of the carina; or associated atelectasis or obstructive pneumonitis of the entire lung or separate tumor nodule(s) in the same lobe
T4	Tumor of any size that invades any of the following: mediastinum, heart, great vessels, trachea, recurrent laryngeal nerve, esophagus, vertebral body, carina, separate tumor nodule(s) in a different ipsilateral lobe

* The uncommon superficial spreading tumor of any size with its invasive component limited to the bronchial wall, which may extend proximally to the main bronchus, is also classified as T1a.

Regional Lymph Nodes (N)
N Category	Stage Category Definitions
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
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)
M Category	Stage Category Definitions
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

No distant metastasis (no pathologic M0; use clinical M to complete stage group)
**Most pleural (and pericardial) effusions with lung cancer are due to tumor. In a few patients, however, multiple cytopathologic examinations of pleural (pericardial) fluid are negative for tumor, and the fluid is nonbloody and is not an exudate. Where these elements and clinical judgement dictate that the effusion is not related to the tumor, the effusion should be excluded as a staging element and the patient should be classified as M0.

Anatomic Stage/Prognostic Groups
Stage	T	N	M
Occult	TX	N0	M0
0	Tis	N0	M0
IA	T1a	N0	M0
IA	T1b	N0	M0
IB	T2a	N0	M0
IIA	T2b	N0	M0
IIA	T1a	N1	M0
IIA	T1b	N1	M0
IIA	T2a	N1	M0
IIB	T2b	N1	M0
IIB	T3	N0	M0
IIIA	T1a	N2	M0
IIIA	T1b	N2	M0
IIIA	T2a	N2	M0
IIIA	T2b	N2	M0
IIIA	T3	N1	M0
IIIA	T3	N2	M0
IIIA	T4	N0	M0
IIIA	T4	N1	M0
IIIB	T1a	N3	M0
IIIB	T1b	N3	M0
IIIB	T2a	N3	M0
IIIB	T2b	N3	M0
IIIB	T3	N3	M0
IIIB	T4	N2	M0
IIIB	T4	N3	M0
IV	Any T	Any N	M1a
IV	Any T	Any N	M1b