TABLE 1.
Patient, tumor, and treatment characteristics
| Patient characteristics | Number (%) | |
|---|---|---|
| Sex | Male/female | 18 (53%)/16 (47%) |
| Age (years) | Median | 52 |
| Range | 16‐76 | |
| Performance status | 0/1/2 | 12 (35%)/18 (53%)/4 (12%) |
| Eye symptom | Yes/no | 20 (59%)/14 (41%) |
| Tumor characteristics | ||
| Tumor site | Skull base | 34 (100%) |
| Histology | Chordoma | 34 (100%) |
| Tumor status | Recurrence | 7 (20%) |
| Residual tumor | 22 (65%) | |
| Naïve tumor | 5 (15%) | |
| GTV (cc) | Median | 18.7 |
| Range | 1.5‐126.7 | |
| Treatment characteristics | ||
| Total dose | 60.8 Gy (RBE) | 34 (100%) |
| Fractions | 16 fractions (4 fractions a week) | 34 (100%) |
| Treatment period (days) | Median | 28 |
| Range | 24‐33 | |
| D1cc, Gy (RBE) | Median | 58.9 |
| Range | 41.9‐60.4 | |
| Beam delivery | Passive | 33 (97%) |
| Active scanning | 1 (3%) | |
Abbreviations: D1cc, minimum dose received by the maximally irradiated 1 cc of the gross tumor volume; GTV, gross tumor volume; RBE, relative biological effectiveness.