Table 1 Descriptions of T-stage, N-stage and M-stage
T-stage | N-stage | M-stage | |||
|---|---|---|---|---|---|
Stage | Description | Stage | Description | Stage | Description |
T1 | tumor size ≤ 3 cm | N0 | No cancer cells near the lymph nodes | M0 | Cancer cells have not metastasized |
T2 | 3 cm < tumor size ≤ 5 cm | N1 | Cancer cells have spread to the parabronchial nodes or the lymph nodes in the lungs of the primary tumor | M1 | Cancer cells have metastasized |
T3 | 5 cm < tumor size ≤ 7 cm | N2 | Cancer cells have spread to the mediastinal lymph nodes | MX | Cancer metastasis is unknown |
T4 | tumor size > 7 cm | N3 | Cancer cells have spread to lymph nodes without the primary tumor |  |  |
TX | undetectable | NX | Lymph nodes near the tumor were not tested | Â | Â |