TNM Staging Group
T / M Sub classification N0 N1 N2 N3
T1 T1a T1b IA IIA IIIA IIIB
IA IIA IIIA IIIB
T2 T2a T2b IB IIA IIIA IIIB
IIA IIB IIIA IIIB
T3 T3 IIB IIIA IIIA IIIB
T4 T4 IIIA IIIA IIIB IIIB
M M1a M1b IV IV IV IV
IV IV IV IV
Table 2: The 7th edition of TNM staging system for lung cancer [22].