Table 1 Details of the primary tumors for metastatic lymph nodes

Metastatic n = 34 (50%)

Malignant grade

 1

2 (6%)

 2

19 (56%)

 3

13 (38%)

ER (positive)

31 (91%)

PR (positive)

28 (82%)

HER2 (positive)

10 (29%)

Ki-67^a

0.25 ± 0.17

BIRADS

 4

5 (15%)

 5

13 (38%)

 6

16 (47%)

Histological Type

 Invasive ductal carcinoma

27 (79%)

 Invasive lobular carcinoma

5 (15%)

 Invasive mammary carcinoma with mixed ductal and lobular features

2 (6%)