Table 1.
Characteristics of the 13 patients and 60 lesions
| Patients (n = 13) | |
| Median age (range) | 69 years (42–87) |
| Male/female | 3/10 |
| Histology | |
| Papillary cancer | 3 |
| Follicular cancer | 9 |
| Poorly differentiated cancer | 1 |
| TNM stage* at the time of initial surgery | |
| II | 3 |
| III | 3 |
| IVA | 2 |
| IVC | 4 |
| Unknown | 1 |
| Distant metastases other than bone metastases at the time of SRT | |
| Nothing | 7 |
| Lung | 2 |
| Lung and brain | 2 |
| Liver | 1 |
| Lung, brain and pancreas | 1 |
| Median duration from initial surgery to SRT (range) | 52 months (1–380) |
| Previous treatment | |
| RAI therapy yes/no | 10/3 |
| (range of cumulative dose) | (1110–18 870 MBq) |
| Surgery yes/no | 2/11 |
| EBRT yes/no | 2/11 |
| TKI treatment yes/no | 1/12 |
| Number of treated lesions per patient | |
| 1 | 4 |
| 2 | 3 |
| 3 | 1 |
| 4 | 2 |
| 9 | 1 |
| 29 | 1 |
| Lesions (n = 60) | |
| Site of lesion | |
| Skull | 2 |
| Cervical spine | 7 |
| Thoracic spine | 11 |
| Lumbar spine | 10 |
| Ribs | 10 |
| Scapula | 5 |
| Pelvis | 11 |
| Others** | 4 |
| Median size of lesions (range) | 21 mm (5.5–70) |
| Symptoms caused by bone metastasis yes/no | 7/53 |
| Median number of fractions (range) | 3 fx (1–10) |
| Median dose of SRT (range) | 27 Gy (8–48) |
*TNM Classification of Malignant Tumours 7th ed, SRT=stereotactic radiotherapy, RAI=radioactive iodine, EBRT=external beam radiotherapy, TKI=tyrosine kinase inhibitor.
**Others include hyoid, clavicles and sternum.