Table 1. Stage Grouping Comparisons: Sixth Edition Versus Seventh Edition Descriptors, T and M Categories, and Stage Groupingsa,b
Sixth Edition T/M Descriptor (cm)
Seventh Edition T/M
T = primary tumor; 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); M = distant metastasis.
a Cells in bold indicate a change from the sixth edition for a particular TNM category.
b Reprinted with permission from Goldstraw P, Crowley J, Chansky K, et al.: The IASLC Lung Cancer Staging Project: Proposals for the revision of the TNM stage groupings in the forthcoming (seventh) edition of the TNM classification of malignant tumours.J. Thorac Oncol 2:706-14, 2007.