Survival Outcome and Impact of Chemotherapy in T1 Node-Negative Triple-Negative Breast Cancer: A SEER Database Analysis

Table 4

Univariate and multivariate analyses of breast cancer-specific survival.

Variables	Univariate analysis			Multivariate analysis
	HR	95% CI		HR	95% CI
Age (years)
>50 vs. ≤ 50	1.599	0.979–2.613	0.061	1.686	1.027–2.769	0.039
Histologic subtype
Lobular vs. ductal	0.000	0.000	0.948	0.000	0.000	0.948
Tumor size
T1a	1			1
T1b	2.281	0.951–5.466	0.065	2.462	1.019–5.950	0.045
T1c	3.160	1.392–7.173	0.006	3.550	1.542–8.173	0.003
Grade
3 vs. 1–2	1.461	0.997–2.140	0.052	1.246	0.845–1.838	0.268
Chemotherapy
No/unknown vs. yes	1.374	1.003–1.882	0.048	1.615	1.174–2.222	0.003

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