TABLE 2.
IDH Status (IDH1/IDH2) in 370 Glial Tumors
| IDH Status | Status Known (n) | Wild-Type (n) | Mutant (n) |
|---|---|---|---|
| Astrocytoma | 297 | 235 | 62 |
| Oligodendroglioma | 33 | 0 | 33 |
| Glioma NOS | 40 | 26 | 14 |
| Total | 370 | ||
| High-grade | 298 | 234 | 64 |
| Low-grade | 61 | 20 | 41 |
| Total | 359 | ||
| I | 6 | 6 | 0 |
| II | 51 | 11 | 40 |
| III | 59 | 16 | 43 |
| IV | 221 | 205 | 16 |
| Total | 337 | ||
| Grade IV (GBM) | 219 | 204 | 15 |
| Grade III (AA) | 43 | 14 | 29 |
| Grade II (LGG) | 26 | 10 | 16 |
| Grade I (Pilocytic astrocytoma) | 6 | 6 | 0 |
| Grade II Oligodendroglioma | 21 | 0 | 21 |
| Grade III Oligodendroglioma | 11 | 0 | 11 |
NOS, not otherwise specified; GBM, glioblastoma multiforme; AA, anaplastic astrocytoma; LGG, low-grade glioma.