Table 3.

Univariable Analysis Predicting OS in Stage IV Breast Cancer Patients

Variable	N	HR (95% CI)	P value
Surgery (yes vs no)	243	0.53 (0.36–0.86)	0.002
Age (<50 vs ≥50 yr)	243	1.12(0.75–1.27)	0.709
Bone metastasis	243	0.84 (0.63–1.63)	0.746
Visceral organ metastasis	243	2.15 (1.22–3.86)	0.000
Number of metastases(continuous)	243	1.24(0.69–1.54)	0.054
ER(+ vs.-)	243	0.66 (0.59–0.94)	0.001
PR(+ vs.-)	243	0.73 (0.58–0.82)	0.029
HER2(+ vs.-)	243	1.46 (0.62–1.83)	0.065

Abbreviations: HR, hazard ratio; ER, estrogen receptor; PR, progesterone receptor; HER2, human epidermal growth factor 2.