Table 2. Anatomic stage/prognostic groups

Stage	T	N	M
Ia	T1a	N0	M0
Ia	T1b	N0	M0
Ib	T2a	N0	M0
IIa	T1a	N1	M0
	T1b	N1	M0
	T2a	N1	M0
	T2b	N0	M0
IIb	T2b	N1	M0
IIb	T3	N0	M0
IIIa	T1	N2	M0
	T2	N2	M0
	T3	N2	M0
	T3	N1	M0
	T4	N0	M0
	T4	N1	M0
IIIb	T4	N2	M0
	T1	N3	M0
	T2	N3	M0
	T3	N3	M0
	T4	N3	M0
IV	T any	N any	M1a or 1b

T: tumour; N: node; M: metastasis. Reproduced from [18] with permission from the publisher.