Table 2 Descriptive statistics of study cohort in metastatic setting (n = 89)

Age (years)

Mean ± SD

58.16 ± 14.45

Age groups

≤ 50 years

29 (32.6)

> 50 years

60 (67.4)

Gender

Male

2 (2.2)

Female

87 (97.8)

Site of biopsy

Lung

39 (43.82)

Bone

13 (14.61)

Axillary lymph node

3 (3.37)

Bladder

2 (2.25)

Liver

5 (5.62)

Mediastinal lymph node

9 (10.11)

Pleura

3 (3.37)

Skin

2 (2.25)

Others

13 (14.60)

Primary origin of tumor

Breast

80 (89.9)

Bladder

2 (2.2)

Lung

4 (4.5)

Mullerian

2 (2.2)

Gastrointestinal

1 (1.1)

History of breast cancer

Yes

77 (86.5)

No

12 (13.5)

Primary breast tumor type (n = 70) *

Ductal

58 (82.9)

Lobular

2 (2.9)

Metaplastic

6 (8.6)

Micropapillary

2 (2.9)

Others

3 (4.2)

Primary breast tumor grade (n = 70) *

Low-intermediate

25 (35.7)

High

45 (64.3)