Table 1 Patient Demographic Data A total of 54 metastatic breast cancer patients were recruited for this study

Age (median)

57 years

Gender

Female

54 (100%)

Race

Asian

4 (7%)

Black

4 (7%)

Hispanic

1 (2%)

White

33 (61%)

Other/unknown

12 (22%)

Grade

0

1 (2%)

1

1 (2%)

2

14 (26%)

3

21 (39%)

Unknown

17 (31%)

Histology

IDC*

48 (76%)

ILC

3 (5%)

Unknown

12 (19%)

Estrogen receptor

Positive( +)

22 (41%)

Negative (−)

27 (50%)

Unknown

5 (9%)

Progesterone receptor

Positive ( +)

13 (24%)

Negative (-)

37 (69%)

Unknown

4 (7%)

HER2 receptor

Positive ( +)

11 (20%)

Negative (−)

40 (74%)

Unknown

3 (6%)

TNBC

20 (37%)

CAMLs present

53 (98%)

Average CAMLs per patient

5 CAMLs

CTCs present

34 (63%)

Average CTCs per patient

4 CTCs

Average prior therapies

3