Clinicopathologic Staging vs. Simplified Subgroups of Thymic Epithelial Tumors Based on WHO Classification
| Staging system of Masaoka et al. (13) | TNM system | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Simplified WHO classification | I | II.1 | II.2 | III | IVa | IVb | I | II | III | IVa | IVb |
| Low-risk thymoma (n = 8) | 4 | 1 | 2 | 0 | 1 | 0 | 4 | 3 | 0 | 1 | 0 |
| High-risk thymoma (n = 9) | 1 | 4 | 1 | 0 | 3 | 0 | 1 | 5 | 0 | 3 | 0 |
| Thymic carcinoma (n = 16) | 1 | 4 | 0 | 2 | 2 | 7 | 1 | 4 | 2 | 2 | 7 |