| Tumour size ≤2 cm | T1 | T1a |
| Tumour size >2 cm but ≤3 cm | T1 | T1b |
| Tumour size >3 cm but ≤5 cm | T2 | T2a |
| Tumour size >5 cm but ≤7 cm | T2 | T2b |
| Tumour size >7 cm | T2 | T3 |
| Additional tumour nodule(s) in the same lobe of the primary tumour | T4 | T3 |
| Additional tumour nodule(s) in another ipsilateral lobe | M1 | T4 |
| Pleural dissemination (malignant pleural effusion and separated pleural nodules) | T4 | M1a |
| Intrathoracic metastases | M1 | M1a |
| Extrathoracic metastases | M1 | M1b |
| T2b N0 M0 | Stage IB | Stage IIA |
| T2a N1 M0 | Stage IIB | Stage IIA |
| T4 N0–N1 M0 | Stage IIIB | Stage IIIA |
| Small cell carcinomas | Included | Included; use of TNM favoured over “limited versus extended” classification |
| Broncho-pulmonary carcinoids | Excluded | Included |