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. 2017 Oct 26;7:249. doi: 10.3389/fonc.2017.00249

Table 2.

Subdivisions of N1-3 disease according to the seventh and eighth editions of the Tumor–Node–Metastasis classification (22, 23, 24).

Nodal subdivision Seventh edition Eighth edition
N1a Single N1 zone Single N1 station
N1b Multiple N1 zones Multiple N1 stations
N2a Single N2 zone Single N2 station
N2a1 Single N2 station (skip metastasis)
N2a2 Single N2 station (with N1 involvement)
N2b Multiple N2 zones Multiple N2 stations
N3 Contralateral hilar or mediastinal lymph node stations or scalene or supraclavicular lymph nodes Contralateral hilar or mediastinal lymph node stations or scalene or supraclavicular lymph nodes