TABLE 1.

Clinicopathological characteristics of samples in cohorts.

Clinicopathological characteristics	Number of samples
	Training cohort (n = 350)	Internal validation cohort (n = 148)	External validation cohort (n = 223)
INSS stage
No-4	220	95	134
4	130	53	89
Age
≥18 months	140	58	120
<18 months	210	90	103
MYCN status
Not Amplified	287	114	176
Amplified	58	34	46
NA	5	0	1
Progression
Yes	136	47	89
No	214	101	134