Table 1.
Demographics and clinicopathological characteristics of patients with Ewing sarcoma
| Characteristics | Training set(n = 406) | Percent (%) | Validation set(n = 172) | Percent (%) |
|---|---|---|---|---|
| Number of patients | Number of patients | |||
| Age (years) | ||||
| ≤ 18 | 248 | 61.1 | 107 | 62.2 |
| 19–27 | 89 | 21.9 | 38 | 22.1 |
| ≥ 28 | 69 | 17.0 | 27 | 15.7 |
| Sex | ||||
| Male | 250 | 61.6 | 104 | 60.5 |
| Female | 156 | 38.4 | 68 | 39.5 |
| Race | ||||
| White | 344 | 84.7 | 155 | 90.1 |
| Black | 18 | 4.5 | 6 | 3.5 |
| Others/unknown | 44 | 10.8 | 11 | 6.4 |
| stage | ||||
| II | 212 | 52.1 | 88 | 51.2 |
| III | 6 | 1.5 | 1 | 0.6 |
| IV | 141 | 34.7 | 57 | 33.1 |
| Others/unknown | 47 | 11.7 | 26 | 15.1 |
| T stage | ||||
| T0-T1 | 165 | 40.6 | 59 | 34.3 |
| T2 | 143 | 35.2 | 67 | 39.0 |
| T3 | 21 | 5.2 | 8 | 4.6 |
| Tx | 77 | 19.0 | 38 | 22.1 |
| N stage | ||||
| N0 | 345 | 85.0 | 147 | 85.5 |
| N1 | 28 | 6.9 | 12 | 7.0 |
| Nx | 33 | 8.1 | 13 | 7.5 |
| M stage | ||||
| M0 | 274 | 67.5 | 117 | 68.0 |
| M1 | 132 | 32.5 | 55 | 32.0 |
| Bone metastasis | ||||
| Yes | 56 | 13.8 | 26 | 15.1 |
| No/unknown | 350 | 86.2 | 146 | 84.9 |
| Brain metastasis | ||||
| Yes | 4 | 1.0 | 2 | 1.2 |
| No/unknown | 402 | 99.0 | 170 | 98.8 |
| Liver metastasis | ||||
| Yes | 4 | 1.0 | 2 | 1.2 |
| No/unknown | 402 | 99.0 | 170 | 98.8 |
| Lung metastasis | ||||
| Yes | 71 | 17.5 | 37 | 21.5 |
| No/unknown | 335 | 82.5 | 135 | 78.5 |