Table 1.
Risk factors for radiation myelopathy after re-irradiation
| Risk factor | Characteristic | Points |
|---|---|---|
| Time interval | <6 months | 4.5 |
| ≥6 months | 0 | |
| EQD2 for first or second course | ≥51 Gy | 4.5 |
| EQD2 for both courses | <51 Gy | 0 |
| Cumulative EQD2, both courses | 60.1–65 Gy | 1 |
| 65.1–70 Gy | 2 | |
| 70.1–75 Gy | 3 | |
| 75.1–80 Gy | 4 | |
| 80.1–85 Gy | 5 | |
| 85.1–90 Gy | 6 |
EQD2 equivalent dose in 2‑Gy fractions. For doses >90 Gy the same principle of adding one point per dose interval applies. Low risk: point sum 0‑3, intermediate risk: point sum 4–6, high risk: point sum >6.