Table 1. Patient demographics and primary tumor characteristics.

Characteristic	Number (%)
Age (y)
Median (range)	56 (32-88)
≤50	39/110 (35.5%)
>50	71/110 (64.5%)
Tumor localization in breast (region)
Upper outer	49/110 (44.5%)
Upper inner	21/110 (19.1%)
Lower outer	22/110 (20%)
Lower inner	10/110 (9.1%)
Central	8/110 (7.3%)
Tumor size (region)
≤2 cm	56/110 (50.9%)
>2 cm	48/110 (43.6%)
NA	6/110 (5.5%)
Axillary nodal status (pN)
Negative	70/110 (63.6%)
Positive	40/110 (36.4%)
Pathology
Invasive ductal carcinoma	94/110 (85.5%)
Invasive lobular carcinoma	4/110 (3.6%)
Other	8/110 (7.3%)
NA	4/110 (3.6%)
Tumor grade
1-well differentiated	15/110 (13.6%)
2-moderately differentiated	47/110 (42.7%)
3-poorly differentiated	44/110 (40%)
NA	13/110 (11.8%)

NA:Not available.