Factors Influencing the Outcome of Patients with Primary Ewing Sarcoma of the Sacrum

Table 2

Multivariate analysis with the Cox proportional hazards model of overall survival in patients with primary EwS of the sacrum (main analysis was OS).

		Hazard ratio	95% confidence interval
			Lower	Upper
Sex (male/female)	0.26	1.58	0.71	3.52
Metastases at diagnosis	<0.001	4.23	1.84	9.70
Tumor volume (≥200 mL/<200 mL)	0.04	2.14	1.03	4.46
Study protocol (GPOH EE99/EWING2008)	0.25	1.64	0.70
Age group (≥18 years/<18 years)	0.01	2.92	1.29	6.60
Surgery	0.06
Surgery  radiotherapy	0.02	0.17	0.04	0.74
Radiotherapy	0.10	0.33	0.09	1.21