Overall lung cancer stage groupings based on tumour size, nodal involvement and metastases location
| T/M status | T size criteria / M site criteria | N0 | N1 | N2 | N3 |
|---|---|---|---|---|---|
| T1 | T1a (≤1 cm) | IA1 | IIB | IIIA | IIIB |
| T1b (>1 to ≤2 cm) | IA2 | IIB | IIIA | IIIB | |
| T1c (>2 to ≤3 cm) | IA3 | IIB | IIIA | IIIB | |
| T2 | T2a (>3 to ≤4 cm) | IB | IIB | IIIA | IIIB |
| T2b (>4 to ≤5 cm) | IIA | IIB | IIIA | IIIB | |
| T3 | T3 (>5 to ≤7 cm) | IIB | IIIA | IIIB | IIIC |
| T4 | T4 (>7 cm) | IIIA | IIIA | IIIB | IIIC |
| M1 | M1a (lung/pericardial metastases) | IVA | IVA | IVA | IVA |
| M1b (single extrathoracic metastasis) | IVA | IVA | IVA | IVA | |
| M1c (multiple extrathoracic metastases) | IVB | IVB | IVB | IVB |
M = metastases; N = nodal stations involved; T = tumour.