Table 2.
Radiation treatment parameters
| Median | Minimum | Maximum | |
| Dose @ isocenter (Gy)* | |||
| All patients | 14 | 6* | 20 |
| Upfront SRS | 13 | 6* | 20 |
| SRS at recurrence | 15 | 9 | 20 |
| Peripheral dose (%) | |||
| All patients | 80 | 40 | 100 |
| Upfront SRS | 80 | 50 | 100 |
| SRS at recurrence | 80 | 40 | 90 |
| Number of isocenters | |||
| All patients | 2 | 1 | 7 |
| Upfront SRS | 1 | 1 | 3 |
| SRS at recurrence | 2 | 1 | 7 |
| Number of beams/arcs | |||
| All patients | 12 | 6 | 32 |
| Upfront SRS | 12 | 7 | 24 |
| SRS at recurrence | 12 | 6 | 32 |
| GTV (ml) | |||
| All patients | 9.2 | 0.2 | 85.4 |
| Upfront SRS | 13.2 | 1.5 | 85.4 |
| SRS at recurrence | 8.4 | 0.2 | 32.2 |
| Upfront fractionated RT dose (all patients) | 60 | 50 | 65 |
* because of worsening neurological symptoms, large treatment volume and critical location, one patient was prescribed an unusually low isocenter dose of 6 Gy.