Evaluation of Risk Factors for Vertebral Compression Fracture after Carbon-Ion Radiotherapy for Primary Spinal and Paraspinal Sarcoma

Table 1

Patient characteristics.

Variable	Number of cases
Total patients	30
Sex
M	18
F	12
Level
Cervical	5
Thoracic	7
Lumbar	8
Sacral	10
Histology
Chordoma	8
Osteosarcoma	5
	5
	5
Chondrosarcoma	2
Leiomyosarcoma	2
Others	3
Tumor size
<5 cm
≤5 cm
Irradiation dose
<70.4 Gy (RBE)	18
70.4 Gy (RBE)	12
Chemotherapy
Yes	16
No	14

: malignant peripheral nerve sheath tumor; : undifferentiated pleomorphic sarcoma.