Table 2. Parameters from TNM, SEER and AJCC (7th edition) staging system of mediastinal teratoma.
| Parameters | Number | Percent (%) |
|---|---|---|
| TNM | ||
| T stage | ||
| T1 | 5 | 23.8 |
| T2 | 10 | 47.6 |
| T3 | 0 | 0 |
| T4 | 0 | 0 |
| Unknown | 6 | 28.6 |
| N stage | ||
| N0 | 14 | 66.7 |
| N1 | 2 | 9.5 |
| N2 | 0 | 0 |
| N3 | 0 | 0 |
| Unknown | 5 | 23.8 |
| M stage | ||
| M0 | 18 | 85.7 |
| M1 | 3 | 14.3 |
| SEER stage | 83 | |
| Localized | 28 | 33.7 |
| Regional | 26 | 31.3 |
| Distant | 23 | 27.7 |
| Unstaged | 6 | 7.2 |
| AJCC stage | ||
| I | 11 | 52.4 |
| II | 1 | 4.8 |
| III | 2 | 9.5 |
| IV | 3 | 14.3 |
| Unknown | 4 | 19.0 |
| Grade | ||
| I | 3 | 2.3 |
| II | 5 | 3.8 |
| III | 7 | 5.3 |
| IV | 5 | 3.8 |
| Unknown | 113 | 85.0 |
TNM, tumor-node-metastasis; SEER, surveillance, epidemiology and end results; AJCC, American Joint Committee on Cancer.