International staging system for lung cancer: stage groupings of TNM subsets (revised version, Mountain 1996)6
| TX, tumour that cannot be assessed, or tumour confirmed by cytology but not identified by imaging or bronchoscopy. | |
| Tis, carcinoma in situ. | |
| Occult carcinoma | TX N0 M0 |
| Stage 0 | Tis N0 M0 |
| Stage 1A | T1 N0 M0 |
| Stage 1B | T2 N0 M0 |
| Stage 2A | T1 N1 M0 |
| Stage 2B | T2 N1 M0 |
| T3 N0 M0 | |
| Stage 3A | T3 N1 M0 |
| T1-3 N2 M0 | |
| Stage 3B | T1-4 N3 M0 |
| T4 N0-3 M0 | |
| Stage 4 | T1-4 N0-3 M1 |