Characteristic | Paired primary-metastatic OS (n = 31) | Metastatic OS (n = 30) | Non-metastatic OS (n = 30) |
---|---|---|---|
Age, years | 12 (5–23)a | 11 (5–21)a | 14 (7–23)a |
Gender (%) | |||
 Male | 21 | 20 | 20 |
 Female | 10 | 10 | 10 |
Primary tumor size (cm) | 3.2 (2–20)a | 3 (2–20)a | 4 (2–20)a |
Grade (%) | |||
 1 | 25 | 24 | 26 |
 2 | 1 | 1 | 0 |
 3 | 3 | 3 | 2 |
 4 | 2 | 2 | 2 |
Follow-up (months) | |||
 Median | 42.3 | 39.1 | 52.5 |
 Range | 2.5–114.3 | 2.5–98.5 | 13.2–114.3 |
 Mean | 62.9 | 46.7 | 70.4 |