Table 1.
Characteristics of the patients, their disease, and treatments
| Characteristic | No. | % |
|---|---|---|
| Sex | ||
| Male | 26 | 51 |
| Female | 25 | 49 |
| Age (years) | ||
| Median | 36 | |
| Range | 14‐68 | |
| Histology | ||
| Chondrosarcoma | 20 | 39.2 |
| Rhabdomyosarcoma | 10 | 19.6 |
| Pleomorphic sarcoma | 3 | 5.9 |
| desmoid‐type fibromatosis | 2 | 3.9 |
| Spindle cell sarcoma | 2 | 3.9 |
| Osteosarcoma | 4 | 7.8 |
| Others | 10 | 19.6 |
| Site | ||
| Skull base | 17 | 33.3 |
| Nasal cavity‐paranasal sinus | 15 | 29.4 |
| Nasopharynx | 2 | 3.9 |
| Oropharynx | 3 | 5.9 |
| Oral cavity | 5 | 9.8 |
| Major salivary gland | 1 | 2.0 |
| Neck | 3 | 5.9 |
| Orbit | 5 | 9.8 |
| Clinical stage | ||
| I ~ II | 27 | 52.9 |
| III ~ IV+recurrent | 24 | 47.1 |
| Primary or recurrent | ||
| Primary | 29 | 56.9 |
| Recurrent/second primary | 22 | 43.1 |
| Re‐radiotherapy | ||
| Yes | 12 | 23.5 |
| No | 39 | 76.5 |
| Surgery | ||
| R0 + R1 | 4 | 7.8 |
| R2 + biopsy + no surgery | 47 | 92.2 |
| Chemotherapy | ||
| Yes | 18 | 35.3 |
| No | 33 | 64.7 |
| PT beam types | ||
| IMPT | 2 | 3.9 |
| IMCT | 41 | 80.4 |
| IMPT + IMCT | 8 | 15.7 |
Abbreviations: IMCT, intensity‐modulated carbon‐ion radiotherapy; IMPT, intensity‐modulated proton radiotherapy; KPS, Karnofsky performance status; PT, particle radiotherapy.