Table 2 Relationships between overall survival and WHO histological subtype according to the Masaoka–Koga staging system
WHO classification (2004) | Noof Pts | Â | Masaoka-Koga Stages | Survival rates (%) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Â | (%) | I | II | III | IVa | IVb | 5-yr OS | 10-yr OS | |
Thymoma | 119 | Â | 52 | 31 | 12 | 18 | 6 | 85.4 | 71.5 |
A | 5 | 2.7 | 4 | 1 | 0 | 0 | 0 | 100 | - |
AB | 33 | 17.6 | 21 | 8 | 1 | 2 | 1 | 96.3 | 73.8 |
B1 | 19 | 10.2 | 11 | 5 | 0 | 2 | 1 | 90.9 | 68.2 |
B2 | 39 | 20.9 | 12 | 9 | 8 | 8 | 2 | 79.8 | 67.3 |
B3 | 15 | 8.0 | 1 | 5 | 3 | 5 | 1 | 61.6 | 61.6 |
Thymoma, other | 8 | 4.3 | 3 | 3 | 0 | 1 | 1 | 68.6 | 68.8 |
Thymic carcinoma | 68 | 36.4 | 0 | 6 | 10 | 16 | 36 | 33.8 | 2.3 |
Thymic carcinoma excluding NEC | 57 | 30.5 | 0 | 5 | 9 | 13 | 30 | 33.0 | 4.1 |
NETT | 11 | 5.9 | 0 | 1 | 1 | 3 | 6 | 27.3 | 9.1 |
Total | 187 | 100.0 | 52 | 37 | 22 | 34 | 42 | 65.9 | 45.3 |