Table 1.

Characteristics of patients in training and verification cohorts.

Characteristic	Training cohort (n = 83)	Validation cohort (n = 53)
Age, mean ± SD	14.54 ± 3.81	18.71 ± 12.20
Gender, no. (%)
Female	37 (45%)	19 (36%)
Male	46 (55%)	34 (64%)
Metastasis, no. (%)
No	61 (73%)	19 (36%)
Yes	22 (27%)	34 (64%)
Event, no. (%)
None	33 (40%)	NA
Relapse	37 (45%)	NA
Dead	2 (2%)	NA
Other	11 (13%)	NA
Tumor. location, no. (%)
Arm	7(8%)	7 (13%)
Leg	72(87%)	44 (83%)
Other	4(5%)	2 (4%)
Huvos. grade, no. (%)
1	NA	13 (25%)
2	NA	16 (30%)
3	NA	13 (25%)
4	NA	5 (9%)
Unknown	NA	6 (11%)