Table 4. Prognostic values (p value and Hazard Ratios when p-value < 0.05) of classical prognostic factors derived from initial staging and of metrics derived from initial FDG-PET, on univariate 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	0.0008	11.466	0.053	6.074
Lung Metastasis	0.0143	5.941	0.619	-	0.003	6.427	0.01	6.26
Histologicsubtypes	-	-	-	-	0.018	0.265	0.04	0.247
Elongation					0.0044	5.684	0.0062	7.113

Significant p-value in bold.

For EWS, anatomic primary site corresponds to primary tumor site (axial/pelvic vs peripheral).

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

EWS: Ewing sarcoma; OST: Osteosarcoma