Table 3. Univariate and multivariate Cox regression analyses for outcomes in N− adjuvant patients after matching (n = 78).

OS
	Univariate		Multivariate
Factor	HR (95% CI)	p	HR (95% CI)	p
Lymphovascular invasion
Absent	1		1
Present	12.597 (1.624–97.728)	0.015	12.597 (1.624–97.728)	0.015
T
T1	1
T2	3.418 (0.440–26.541)	0.240
T3	2.197 (0.137–35.309)	0.579
Histological grade
G1/G2	1
G3	2.374 (0.774–7.276)	0.130
Molecular subtype
Luminal A	1
Luminal B	1.784 (0.327–9.748)	0.504
HER2	1.958 (0.274–13.965)	0.503
Triple-negative	4.398 (0.846–22.868)	0.078
DMFS
Lymphovascular invasion
Absent	1		1
Present	7.905 (0.969–64.509)	0.054	7.905 (0.969–64.509)	0.054
T
T1	1
T2	Undefined	0.955
T3	Undefined	0.955
Histological grade
G1/G2	1
G3	3.812 (0.948–15.326)	0.059
Molecular subtype
Luminal A	1
Luminal B	Undefined	0.950
HER2	Undefined	0.949
Triple-negative	Undefined	0.947

G1 – well differentiated; G2 – moderately differentiated; G3 – poorly differentiated; T – tumour size