Table 3.
Radiation Treatment Characteristics
| Parameter | N = 31 |
|---|---|
| Dose of original RT (Gy) | |
| Median | 60 |
| Range | 18–60 |
| Original RT technique | |
| 3D conformal | 10 |
| IMRT | 20 |
| Unknown (Plan not available) | 1 |
| Original GTV volume (cm3) | |
| Median | 27.9 |
| Range | 5.8–72 |
| Original PTV volume (cm3) | |
| Mean | 307 |
| Range | 107–601 |
| Interval between original RT and Re-RT (yrs) | |
| Median | 4.28 |
| Range | 0.95–14.5 |
| Re-RT dose (Gy) | |
| Median | 30 |
| Range | 15–54 |
| Re-RT dose per fraction (Gy) | |
| Median | 2.5 |
| Range | 1.8–15 |
| Re-RT technique | |
| 3D conformal | 5 |
| IMRT | 23 |
| 3D conformal with IMRT boost | 2 |
| SRS | 1 |
| Retreat GTV volume (cm3) | |
| Median | 29 |
| Range | 0.3–313 |
| Retreat PTV volume (cm3) | |
| Median | 124 |
| Range | 0.5–511 |
| Cumulative BED (α/β = 2), (Gy) | N = 25 |
| Median | 96 |
| Range | 72–112 |