Table 4.

Multivariate analysis of overall survival.

Factor	Relevant-factor	OS HR (95%CI)	P-Value
ER status	Negative	8.538 (2.580–28.251)	<0.001
Tumor size	≤4 cm	0.239 (0.061–0.942)	0.041
Histological grade			0.036
	Grade1	4.489 (0.346–58.237)	0.251
	Grade2	0.292 (0.075–1.135)	0.076
Lymph nodes	Negative	0.097 (0.023–0.403)	0.001
Age			0.994

HR – hazard ratio; CI – confidence interval.