Table 5. Multivariate cox proportional hazards regression analysis of radiotherapy based on different stages of SCEC.

Stage	CSS		OS
	HR (95% CI)	P-value	HR (95% CI)	P-value
Localized
Radiation Vs None	0.227 (0.091–0.566)	0.001**	0.279 (0.117–0.668)	0.004**
Regional
Radiation Vs None	0.413 (0.153–1.118)	0.082	0.473 (0.180–1.241)	0.128
Distant
Radiation Vs None	0.700 (0.458–1.068)	0.098	0.683 (0.4498–1.037)	0.073

Abbreviations: HR = hazard ratio; CI = confidence interval.

^**P < 0.01