Stage | T | N | M |
Ia | T1a | N0 | M0 |
T1b | N0 | M0 | |
Ib | T2a | N0 | M0 |
IIa | T1a | N1 | M0 |
T1b | N1 | M0 | |
T2a | N1 | M0 | |
T2b | N0 | M0 | |
IIb | T2b | N1 | M0 |
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.