Table 7. Overall survival based on histology.

HR, hazard ratio; CI, confidence interval; Ref: reference; NA, not available; N, number of patients; MBC, metaplastic breast cancer

#Other histology in our study includes ductal carcinoma in situ micropapillary pattern, heterologous type with matrix production, high-grade metaplastic carcinoma, large cells with intermingling mature plasma cells, matrix-producing carcinoma, and sarcomatoid features, and metaplastic carcinoma.

Variable	Variable level	N	Number of events	Estimated median (month)	One-year rate	Two-year rate	Five-year rate	HR (95%CI)	p-value
Histology	Spindle cell	27	10	74.8	92% (73%-98%)	77% (56%-89%)	67% (44%-82%)	Ref
	Squamous	40	15	NA	90% (76%-96%)	77% (61%-88%)	64% (46%-77%)	0.97 (0.43-2.15)	0.94
	Mixed MBC/mesenchymal	54	15	NA	94% (83%-98%)	80% (66%-89%)	73% (58%-83%)	0.71 (0.32-1.58)	0.40
	#Other	11	3	NA	91% (51%-99%)	91% (51%-99%)	71% (34%-90%)	0.56 (0.15-2.05)	0.38