GOECP/SEOR radiotherapy guidelines for small-cell lung cancer

Table 3 Tumor-node-metastasis American Joint Committee on Cancer 8^th edition lung cancer

TNM AJCC 8th edition lung cancer
T: Primary tumour
Tx	Not evaluable by imaging or malignant cells in sputum or bronchial lavage
T0	No evidence of primary tumour
Tis	Carcinoma in situ
T1	≤ 3 cm surrounded by lung or visceral pleura, or lobar bronchus
T1a (mi)	Minimally invasive
T1a	≤ 1 cm
T1b	> 1 cm to ≤ 2 cm
T1c	> 2 cm to ≤ 3 cm
T2	> 3 cm to ≤ 5 cm, or involving main bronchus without affecting the carina, visceral pleura, or atelectasis or obstructive pneumonitis extending to the hilar region, affecting part or all of the lung
T2a	> 3 cm to ≤ 4 cm
T2b	> 4 cm to ≤ 5 cm
T3	> 5 cm to ≤ 7 cm, or tumour nodules in the same lobe, or invasion of the chest wall (parietal pleura), phrenic nerve, parietal pericardium
T4	> 7 cm, or nodules in a different ipsilateral lobe or invasion of the diaphragm, mediastinum, heart, great vessels, trachea, recurrent laryngeal nerve, esophagus, vertebral body, and carina
N: Regional lymph node involvement
Nx	Not evaluable
N0	No node involvement
N1	Ipsilateral peribronchial and/or hilar and intrapulmonary nodes
N2	Ipsilateral mediastinal nodes and/or subcarinal
N3	Contralateral mediastinal or contralateral hilar nodes, or any scalene or supraclavicular nodes
M: Distant metastasis
M0	No metastasis
M1	Distant metastasis
M1a	Nodules in contralateral lobe; pleural or pericardial or pleural or pericardial effusion
M1b	Single extrathoracic metastasis (including non-regional lymph node)
M1c	Multiple extrathoracic metastases

TNM: Tumor-node-metastasis; AJCC: American Joint Committee on Cancer.