Table 5. Prognostic values (p value and Hazard Ratios when significant p-value) of classical prognostic factors derived from initial staging and of metrics derived from initial FDG-PET, on multivariate analysis.

	EWS				OST
Parameter	PFS		OS		PFS		OS
	p-value	Hazard Ratio	p-value	Hazard Ratio	p-value	Hazard Ratio	p-value	Hazard Ratio
Bone Metastasis	0.0002	29.698	NRM	-	-	-	-	-
Lung Metastasis	0.0016	18.78	-	-	0.031	5.308	NRM	-
Histologicsubtypes	-	-	-	-	0.041	0.301	NRM	-
Elongation	-	-	NRM	-	0.019	5.583	0.0062	7.113

Only significant or nearly significant indices on univariate analysis were included on the multivariate analysis. Significant p-value in bold.

For OST, histologic subtypes compares Osteoblastic vs Chondroblastic/Telangiectatic subtypes.

EWS: Ewing sarcoma; OST: Osteosarcoma; NRM: not retained in model.