Descriptors and T and M categories of the eighth edition with seventh edition for comparison*

Descriptor in 7th edition	Descriptor in 8th edition	N categories: 8th edition (7th edition)
		Overall stage
		N0	N1	N2	N3
T1 ≤1 cm	T1a	IA1 (IA)	IIB (IIA)	IIIA	IIIB
T1 >1 to 2 cm	T1b	IA2 (IA)	IIB (IIA)	IIIA	IIIB
T1 >2 to 3 cm	T1c	IA3 (IA)	IIB (IIA)	IIIA	IIIB
T2 >3 to 4 cm	T2a	IB	IIB (IIA)	IIIA	IIIB
T2 >4 to 5 cm	T2b	IIA (IB)	IIB (IIA)	IIIA	IIIB
T2 >5 to 7 cm	T3	IIB (IIA)	IIIA (IIB)	IIIB (IIIA)	IIIC (IIIB)
T3 structures	T3	IIB	IIIA	IIIB (IIIA)	IIIC (IIIB)
T3 >7 cm	T4	IIIA (IIB)	IIIA	IIIB (IIIA)	IIIC (IIIB)
T3 diaphragm	T4	IIIA (IIB)	IIIA	IIIB (IIIA)	IIIC (IIIB)
T3 endobronchial: location/atelectasis 3 to 4 cm	T2a	IB (IIB)	IIB (IIIA)	IIIA	IIIB
T3 endobronchial: location/atelectasis 4 to 5 cm	T2b	IIA (IIB)	IIB (IIIA)	IIIA	IIIB
T4	T4	IIIA	IIIA	IIIB	IIIC (IIIB)
M1a	M1a	IVA (IV)	IVA (IV)	IVA (IV)	IVA (IV)
M1b single lesion	M1b	IVA (IV)	IVA (IV)	IVA (IV)	IVA (IV)
M1c multiple lesions	M1c	IVB (IV)	IVB (IV)	IVB (IV)	IVB (IV)

* Where there is a change, the resultant stage groupings for the eighth edition are in bold, and the stage in the seventh edition is given in parenthesis.

Original figure modified for this publication. Goldstraw P, Chansky K, Crowley J, et al. The IASLC Lung Cancer Staging Project: Proposals for Revision of the TNM Stage Groupings in the Forthcoming (Eighth) Edition of the TNM Classification for Lung Cancer. J Thorac Oncol 2016; 11:39. Table used with the permission of Elsevier Inc. All rights reserved.

Graphic 109806 Version 3.0

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Descriptors and T and M categories of the eighth edition with seventh edition for comparison*