Table 2.

Pathologic findings at surgery

	Standard (N = 16)	Experimental (N = 14)	p value
RCB-0 and RCB-I	10 (62.5%)	14 (100.0%)	0.0035
ER negative	8	6
ER positive	2	8
RCB-II and RCB-III	6 (37.5%)	0 (0.0%)
ER negative	0	0
ER positive	6	0
pCR	10 (62.5%)	12 (85.7%)	0.0660
ER negative	8	6
ER positive	2	6

RCB was pathologically determined from the (1) tumor bed dimensions, (2) cellularity of the invasive cancer, (3) size of largest nodal metastasis, and (4) number of positive lymph nodes. RCB was categorized as RCB-0 = no residual disease, RCB-I = minimal residual disease, RCB-II = moderate residual disease, and RCB-III = extensive residual disease [14]. RCB-0 was synonymous with pCR, indicating no residual disease present in the breast or axilla