Table 1 Demographic data of patients with osteolytic OS and GCT from four centers
Characteristics | Overall (333 patients) | Training set | Internal test set | External test set | |||
|---|---|---|---|---|---|---|---|
Center A (217 patients) | Center A (62 patients) | Center B (24 patients) | Center C (9 patients) | Center D (21 patients) | All (54 patients) | ||
Age (years ± SD) | 27 (12) | 25 (13) | 26 (11) | 29 (12) | 34 (8) | 36 (12) | 33 (11) |
Sex (female) | 147 (44.1%) | 100 (46.1%) | 27 (43.6%) | 12 (50.0%) | 1 (11.1%) | 8 (38.1%) | 21 (38.8%) |
Tumor type | |||||||
Osteolytic OS | 136 (40.8%) | 102 (47.0%) | 22 (35.5%) | 6 (25.0%) | 0 (0%) | 6 (28.6%) | 12 (22.2%) |
GCT | 197 (59.2%) | 115 (53.0%) | 40 (64.5%) | 18 (75.0%) | 9 (100%) | 15 (71.4%) | 42 (77.8%) |
Tumor site | |||||||
Distal femur | 186 (55.9%) | 125 (57.6%) | 34 (54.8%) | 13 (54.2%) | 7 (77.8%) | 7 (33.3%) | 27 (50.0%) |
Proximal tibia | 128 (38.4%) | 78 (35.9%) | 26 (41.9%) | 10 (41.7%) | 2 (22.2%) | 12 (57.1%) | 24 (44.4%) |
Proximal fibula | 19 (5.7%) | 14 (6.5%) | 2 (3.2%) | 1 (4.2%) | 0 (0%) | 2 (9.5%) | 3 (5.6%) |