Table 1.
Clinical Features
| Features | Total(N) | Percentage |
|---|---|---|
| Age(year) | ||
| <12 | 3 | 6.8% |
| 13--20 | 14 | 31.8% |
| 21--30 | 8 | 18.2% |
| 31--40 | 14 | 31.8% |
| 41- | 5 | 11.4% |
| Sex | ||
| Male | 32 | 72.7% |
| Female | 12 | 27.3% |
| Localization of primary tumor | ||
| Distal femur | 13 | 29.5% |
| Proximal tibia | 11 | 25.0% |
| Humerus | 3 | 6.8% |
| Tibia diaphysis | 5 | 11.4% |
| Femur diaphysis | 7 | 15.9% |
| Other | 5 | 11.4% |
| Histological type | ||
| Osteoblastic | 29 | 65.9% |
| Small cell | 1 | 2.3% |
| Chondroblastic | 6 | 13.6% |
| Teleangetatic | 1 | 2.3% |
| Round cell | 2 | 4.5% |
| Fibroblastic | 4 | 9.1% |
| Mixed | 1 | 2.3% |
| Histological Rosen grade* | ||
| 1 | 5 | 11.3% |
| 2 | 16 | 36.4% |
| 3 | 16 | 36.4% |
| 4 | 7 | 15.9% |
| 1+2 | 21 | 47.7% |
| 3+4 | 23 | 52.3% |
| Metastasis | ||
| no | 23 | 53.3% |
| lung | 17 | 38.6% |
| other | 4 | 9.1% |