Table 1.
Patient demographics at diagnosis.
| Characteristic | N (%) |
|---|---|
| Total | 1314 |
| Gender | |
| Male | 792 (60.3) |
| Female | 522 (39.7) |
| Age (mean, years + SD) | 16,8 (9.9) |
| Origin | |
| Osseous | 1107 (84.2) |
| Extra-osseous | 207 (15.8) |
| Primary tumor localization | |
| Extremity | 499 (38.0) |
| Upper | 108 (8.2) |
| Lower | 391 (29.8) |
| Axial | 815 (62.0) |
| Pelvic | 312 (23.7) |
| Other | 503 (38.3) |
| Volume at diagnosis | |
| <200 ml | 740 (56.3) |
| ≥200 ml | 574 (43.7) |
| Skip lesions at diagnosis | 63 (4.8) |
| Disease extent | |
| Localized | 916 (69.7) |
| Pulmonary metastasis | 182 (13.9) |
| Extrapulmonary metastasis | 216 (16.4) |
| Number of metastatic lesions | |
| One | 43 (3.3) |
| ≥2 | 355 (27.0) |
| Local treatment modality | |
| Surgery | 550 (41.9) |
| Radiotherapy | 193 (14.7) |
| Surgery + radiotherapy | 432 (32.9) |
| Pre-operative radiotherapy | 47 (3.6) |
| Post-operative radiotherapy | 385 (29.3) |
| Unknown | 139 (10.5) |
SD = standard deviation.
Continuous variables are presented by means along with corresponding standard deviation between brackets, categorical variables as a number with the percentage between brackets.