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Stage Information for NSCLC

    Table 6. Definitions of TNM Stage IIAa

    StageTNMDescriptionIllustration
    a Reprinted with permission from AJCC: Lung. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 253-70.
    b The uncommon superficial spreading of the 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.
    IIA
    T2b, N0, M0
    T2b = Tumor >5 cm but ≤7 cm or less in greatest dimension,or tumor with any of the following features: involves main bronchus, ≥2 cm distal to the carina; invades visceral pleura (PL1 or PL2);or is associated with atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung.

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    N0 = No regional lymph node metastasis.
    M0 = No distant metastasis.
    T1a, N1, M0T1a = Tumor ≤2 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).b
    N1 = Metastasis in ipsilateral peribronchial and/or ipsilateral hilar lymph nodes and intrapulmonary nodes, including involvement by direct extension.
    M0 = No distant metastasis.
    T1b, N1, M0T1b = Tumor >2 cm but ≤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).b
    N1 = Metastasis in ipsilateral peribronchial and/or ipsilateral hilar lymph nodes and intrapulmonary nodes, including involvement by direct extension.
    M0 = No distant metastasis.
    T2a, N1, M0T2a = Tumor >3 cm but ≤5 cm in greatest dimension,or tumor with any of the following features: involves main bronchus, ≥2 cm distal to the carina; invades visceral pleura (PL1 or PL2);or is associated with atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung.
    N1 = Metastasis in ipsilateral peribronchial and/or ipsilateral hilar lymph nodes and intrapulmonary nodes, including involvement by direct extension.
    M0 = No distant metastasis.
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