Table 1. Base-line characteristics.

Characteristics	N=112
Age/year
Median	52
Range	29–72
Menopausal status, n (%)
Pre-menopause	40 (35.7)
Post-menopause	72 (64.3)
Hormone receptor, n (%)
ER (+)	47 (42.0)
PR (+)	33 (29.5)
Molecular subtyping, n (%)
Luminal A	9 (8.0)
Luminal B	35 (31.3)
HER (+)	64 (57.1)
Disease stage, n (%)
II	3 (2.7)
III	19 (17.0)
IV	90 (80.4)
Common metastatic site, n (%)
Pulmonary	49 (43.8)
Bone	34 (30.4)
Liver	30 (26.8)
Brain	21 (18.8)
Others	15 (13.4)
Number of metastatic sites, n (%)
0	22 (19.6)
1	49 (43.8)
2	26 (23.2)
≥3	15 (13.4)