Stage IIB Lung Cancer AJCC v9

**Semantic type:** Neoplastic Process

**Definition:** Stage IIB includes: (T3, N0, M0); (T1, N2a, M0); (T2a, N1, M0); (T2b, N1, M0). T3: Tumor measuring more than 5 cm but 7 cm or less in greatest dimension or tumor measuring 7 cm or less with one or more of the following features: invasion of parietal pleura or chest wall; invasion of pericardium, phrenic nerve or azygos vein (although these structures lie within the mediastinum, the degree of mediastinal penetration by the tumor needed to invade these structures is not counted as T4); invasion of thoracic nerve roots (i.e., T1, T2) or stellate ganglion; presence of separate tumor nodule(s) in the same lobe as the primary. T1: Tumor measuring 3 cm or less in greatest dimension surrounded by lung or visceral pleura, or in a lobar or more peripheral bronchus. T2a: Tumor measuring more than 3 cm but 4 cm or less in greatest dimension or tumor measuring 4 cm or less in greatest dimension with one or more of the following features: invasion of visceral pleura; invasion of an adjacent lobe; involvement of main bronchus (up to but not including the carina) or is associated with atelectasis or obstructive pneumonitis, extending to the hilar regions, involving either part of or the entire lung. T2b: Tumor measuring more than 4 cm but 5 cm or less in greatest dimension with or without any of the following features: invasion of visceral pleura; invasion of an adjacent lobe; involvement of main bronchus (up to but not including the carina) or is associated with atelectasis or obstructive pneumonitis, extending to the hilar regions, involving either part of or the entire lung. N0: No tumor involvement of regional lymph node(s). N1: Tumor involvement of ipsilateral peribronchial and/or ipsilateral hilar and/or ipsilateral intrapulmonary lymph node station(s), including involvement by direct extension. M0: No distant metastasis. (AJCC 9th ed.)