The Role of Preoperative Bilateral Breast Magnetic Resonance Imaging in Patient Selection for Partial Breast Irradiation in Ductal Carcinoma In Situ

Table 2

Final pathological results for 117 women eligible for partial breast irradiation on the basis of the initial clinical evaluation, and of the 23 women ultimately ineligible by MRI.

Variable	Overall (𝑁=117)	Ineligible based on MRI findings (𝑁=23)
	No. (%)^a
Tumor size (cm)
Not available	8 (7%)	0 (0%)
0.1-1.0	61 (52%)	6 (26%)
1.1–2.0	28 (24%)	3 (13%)
2.1–3.0	9 (8%)	3 (13%)
>3.0	11 (9%)	11 (48%)
Number of tumors (>1)	14 (12%)	8 (35%)
EIC (positive)	6 (5%)	4 (17%)
T stage
Tis	109 (93%)	18 (78%)
T1a	6 (5%)	3 (13%)
T1b	1 (1%)	1 (4%)
T2	1 (1%)	1 (4%)
N stage
NX	44 (38%)	5 (22%)
N0	70 (60%)	16 (70%)
N1	3 (3%)	2 (9%)
Lymphovascular space invasion
No	113 (97%)	23 (100%)
Yes	1 (1%)	0 (0%)
Not reported/indeterminate	3 (3%)	0 (0%)
Lobular features	1 (1%)	1 (4%)
Grade
Low	26 (22%)	10 (43%)
Intermediate	25 (21%)	2 (9%)
High	66 (56%)	11 (48%)
ER
Negative	25 (21%)	8 (35%)
Positive	89 (76%)	14 (61%)
Not tested/not available	3 (3%)	1 (4%)
PR
Negative	36 (31%)	10 (43%)
Positive	77 (66%)	12 (52%)
Not tested/not available	4 (3%)	1 (4%)

EIC: extensive intraductal component. ER: estrogen receptor. PR: progestin receptor.
^aValues are numbers (percentage).