T/N ratios of methionine SUV, IDH1 gene status, and contrast enhancement by tumour type and grade
| WHO grade | Histological type | n | IDH1 mutation, % | CE on MRI, % | Minimum | Maximum | Mean ±SD |
|---|---|---|---|---|---|---|---|
| Grade 1 | Pilocytic astrocytoma | 5 | NA | 100 | 1.45 | 3.4 | 2.31±0.67 |
| Ganglioglioma | 5 | NA | 80 | 1.4 | 1.8 | 1.61±0.49 | |
| Grade 2 | Diffuse astrocytoma | 18 | 91 | 17 | 0.6 | 1.7 | 1.06±0.32 |
| OT with 1p/19q co-deletion | 26 | 100 | 19 | 1.4 | 2.9 | 1.94±0.58 | |
| OT without 1p/19q co-deletion | 11 | 100 | 36 | 1.4 | 4.5 | 2.67±0.43 | |
| Grade 3 | Anaplastic astrocytoma | 17 | 80 | 76 | 0.8 | 3.7 | 2.38±0.86 |
| Anaplastic OT with 1p/19q co-deletion | 18 | 87 | 56 | 2.2 | 5.3 | 3.49±0.84 | |
| Anaplastic OT without 1p/19q co-deletion | 11 | 40 | 100 | 2.4 | 9.3 | 4.83±1.37 | |
| Grade 4 | Glioblastoma | 33 | 17 | 100 | 1.7 | 7.9 | 4.25±1.59 |
| Total | – | 144 | – | 61 | 0.6 | 9.3 | 2.21±1.08 |
NA, not available; OT, oligodendroglial tumours; SUV, standard uptake value; T/N, tumour-to-normal tissue.