Table 2.

Staging of NSCLC according to the International Association for the Study of Lung Cancer [21].

Stage	Tumor	Lymph Node	Metastasis
Occult carcinoma	TX	N0	M0
Stage 0	Tis	N0	M0
Stage IA	T1mi-c	N0	M0
Stage IB	T2a	N0	M0
Stage IIA	T2b	N0–N1	M0
Stage IIB	T1, T2, T3	N0–N1	M0
Stage IIIA	T1–T4	N0–N2	M0
Stage IIIB	T1a–T4	N2–N3	M0
Stage IVA	Any T	Any N	M1a–b
Stage IVB	Any T	Any N	M1c