A population-based analysis of outcomes for small cell carcinoma of the breast by tumor stage and the use of radiation therapy

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Table 2 Multivariate Cox proportional hazard regression model for patients with localized SCCB

Category ^*	HR	95% CI of HR	P value
Radiation therapy vs no radiation	0.68	0.36-1.31	0.25
Age group	-	-	0.01
- (50–70) vs <50 years	0.88	0.29-2.59
- > 70 years vs <50 years	2.34	0.82-6.98
Race	-	-	0.27
- Black versus white	2.15	0.27-16.84	0.46
- Others versus white	0.08	0.01-2.42	0.15
Surgery vs no surgery	0.01	0.01-0.25	<0.01