Table 5.

Three- and 5-year survival outcome in derivation, validation and whole cohorts

Ewing sarcoma risk score category	Derivation cohort (n=573)		Validation cohort (n=287)		Whole cohort (n=860)
	3-year survival	5-year survival	3-year survival	5-year survival	3-year survival	5-year survival
Overall	44±2%	38±2%	48±3%	34±4%	45±2%	37±2%
Low risk (0)	73±7%	73±7%	81±8%	81±8%	76±5%	76±5%
Intermediate risk (1-3)	53±4%	47±4%	50±5%	29±5%	52±3%	39±3%
High risk (4, 5)	21±4%	14±4%	27±6%	18±6%	23±3%	15±3%