| Clinical stage grouping | Pathological stage grouping | |||||
|---|---|---|---|---|---|---|
| T | N | M | T | N | M | |
| O | Tis | N0 | M0 | Tis | N0 | M0 |
| IA | T1a | N0 | M0 | T1a | N0 | M0 |
| IB | T1bT2a | N0N0 | M0M0 | T1bT2b | N0N0 | M0M0 |
| IIA | T2bT3a | N0N0 | M0M0 | T2bT3a | N0N0 | M0M0 |
| IIB | T3bT4a | N0N0 | M0M0 | T3bT4a | N0N0 | M0M0 |
| IIC | T4b | N0 | M0 | T4b | N0 | M0 |
| III | Any T Any T Any T | N1N2N3 | M0M0M0 | |||
| IIIA | T1-4aT1-4a | N1aN2a | M0M0 | |||
| IIIB | T1-4bT1-4bT1-4aT1-4aT1-4a/b | N1aN2aN1bN2bN2c | M0M0M0M0M0 | |||
| IIIC | T1-4bT1-4bAny T | N1bN2bN3 | M0M0M0 | |||
| IV | Any T | Any N | M1 | Any T | Any N | M1 |
NA = not applicable; LDH = lactate dehydrogenase; * Micrometastasis is diagnosed after sentinel lymph node biopsy; † Micrometastasis is defined as clinically detectable nodal metastases confirmed pathologically.