Table 2.

Pathological response assessment by radiological response group

	Complete response MRI (n = 136)	Partial response MRI (n = 31)	Total (n = 167)
Pathological response surgical specimen
No residual carcinoma (1i)	81 (60%)	8 (26%)	89 (53%)
No residual invasive but DCIS (1ii)	8 (6%)	0	8 (5%)
Minimal residual disease, < 10% (2i)	31 (23%)	8 (25%)	39 (23%)
10-50% of tumor remaining (2ii)	11 (8%)	12 (39%)	23 (14%)
>50% of tumor remaining (2iii)	3 (2%)	3 (10%)	6 (4%)
No evidence of response (3)	1 (1%)	0	1 (1%)
Only LVSI present	1 (1%)	0	1 (1%)
Pathological response biopsies
Tumor-negative	107 (79%)	11 (35%)	118 (71%)
Tumor-positive	29 (21%)	20 (65%)	49 (29%)

Data are n (%). LVSI, lymphovascular invasion