Table 1. Clinical features of OS patients.
| Clinical features | No. (%) |
|---|---|
| Metastasis at diagnosis | |
| Yes | 6 (16) |
| No | 31 (84) |
| Location | |
| Femur | 22 (59) |
| Tibia | 8 (22) |
| Humerus | 3 (8) |
| Others | 4 (11) |
| Size | |
| < 12 cm | 26 (70) |
| ≥ 12 cm | 11 (30) |
| Histology | |
| Osteoblastic | 18 (49) |
| Condroblastic | 4 (11) |
| Fibroblastic | 3 (8) |
| Mixed | 7 (19) |
| Others | 5 (13) |
| Grade of tumor necrosis | |
| < 90% | 18 (49) |
| ≥ 90% | 17 (46) |
| Not identified | 2 (5) |
| Surgery | |
| Conservative | 32 (87) |
| Amputation | 5 (13) |
| Relapse | |
| Yes | 10 (27) |
| No | 27 (73) |
| Local of relapse | |
| Lung | 7 (19) |
| Bone | 4 (11) |
| Metastasis | |
| Yes | 11 (30) |
| No | 26 (70) |
| Local of metastasis | |
| Lung | 10 (27) |
| Bone | 3 (8) |
| Status | |
| Alive | 29 (78) |
| Dead | 8 (22) |