Cross-tabulation of tumor histopathology by WHO 2007 criteria and grade with WHO 2016 criteria for oligodendroglioma (1p/19q codeletion)
| Total (N = 148) | WHO 2016 | ||
|---|---|---|---|
| Oligodendroglioma (1p/19q codeleted) (n = 90) | Astrocytoma (non-1p/19q codeleted) (n = 58) | ||
| WHO 2007 classification | |||
| Oligodendroglioma | 42 (28.4%) | 36 (40.0%) | 6 (10.3%) |
| Oligoastrocytoma | 106 (71.6%) | 54 (60.0%) | 52 (89.7%) |
| Tumor grade | |||
| WHO II | 98 (66.2%) | 58 (64.4%) | 40 (69.0%) |
| WHO III | 50 (33.8%) | 32 (35.6%) | 18 (31.0%) |
| IDH mutation status | |||
| No. | 60 | 39 | 21 |
| IDH-mutant | 58 (96.7%) | 39 (100%) | 19 (90.5%) |
| IDH-wild type | 2 (3.3%) | 0 (0%) | 2 (9.5%) |