S1. Multivariate analysis of patients’ prognosis with TNBCs.

Variables	DFS					OS
	Univariate analysis		Multivariate analysis			Univariate analysis		Multivariate analysis
	P	HR (95% CI)	P	HR (95% CI)		P	HR (95% CI)	P	HR (95% CI)
TNBC, triple negative breast cancer; AR, androgen receptor; DFS, disease-free survival; OS, overall survival; HR, hazard ratio; 95% CI, 95% confidence interval.
Age (year)	0.106	1.012 (0.997−1.027)	0.738	1.004 (0.980−1.029)		0.333	1.009 (0.990−1.029)	0.567	1.009 (0.979−1.040)
High histological grade 3	0.227	1.264 (0.864−1.847)	0.229	1.948 (0.658−5.774)		0.196	1.501 (0.811−2.778)	0.175	2.770 (0.635−12.082)
High TNM stage 3−4	<0.001	5.385 (4.072−7.120)	<0.001	52.330 (20.242−135.282)		<0.001	21.229 (9.537−47.255)	<0.001	26.657 (7.689−92.424)
Tumor emboli	<0.001	3.643 (2.227−5.960)	0.986	1.006 (0.513−1.974)		<0.001	5.471 (2.826−10.592)	0.007	4.178 (1.479−11.808)
AR expression	0.566	0.998 (0.992−1.004)	0.420	0.994 (0.981−1.008)		0.138	0.993 (0.984−1.002)	0.149	0.980 (0.954−1.007)
Metaplastic carcinoma	0.037	2.098 (1.046−4.211)	0.586	0.727 (0.231−2.290)		0.080	2.153 (0.913−5.078)	0.684	1.366 (0.304−6.145)