. Author manuscript; available in PMC: 2022 Aug 1.

Published in final edited form as: J Surg Res. 2021 Apr 3;264:138–148. doi: 10.1016/j.jss.2021.02.020

Table 4.

Cox proportional-hazard analysis for SRCBC Stage I-IV patients, National Cancer Data Base (NCDB), 2004-2016

Variable	Hazard Ratio	95% Confidence Interval	p-value
Underwent Surgery^a
No	Reference
Yes	0.5	0.3- 0.9	0.02
Stage
Stage I	Reference
Stage II	2.2	1.1 – 4.4	0.03
Stage III	1.6	0.8 – 3.4	0.22
Stage IV	4.2	1.9 – 9.4	<0.001
Estrogen Receptor Status
Negative	Reference
Positive	0.5	0.3 – 0.8	<0.01
Received Endocrine Therapy^b
No	Reference
Yes	0.9	0.6 – 1.3	0.57

=patients with Stage IV disease excluded.

=only for those with ER+ disease