TABLE 2.

Multivariable Associations Between Patient and Disease Factors, and Mastectomy Group

OR odds ratio, CI confidence interval, ER estrogen receptor, PR progesterone receptor, BCT breast-conserving therapy, NAC neoadjuvant chemotherapy

Factor	OR (95% CI)	p-value
Age at surgery	0.93 (0.91–0.95)	< .001
Stage		0.001
1 or 2	1.00
3	0.51 (0.34–0.77)
Subtype		0.109
ER−, PR−, HER2−	1.00
ER−, PR−, HER2+	0.49 (0.25–0.93)
ER/PR+, HER2−	0.6 (0.36–1)
ER/PR+, HER2+	0.74 (0.42–1.31)
Candidate for BCT post-NAC	3.12 (2.02–4.82)	< .001
Residual palpable disease	0.71 (0.46–1.09)	0.115
Positive clinical axillary nodes	0.85 (0.42–1.73)	0.662