Table 1. Major clinico-pathological characteristics of 240 breast cancer patients.

Items	n (%)
Age (years)
≤ 50	149 (62.1)
> 50	91 (37.9)
Menopausal status
Premenopausal	134 (55.8)
Postmenopausal	106 (44.2)
T stage (cm)
T1 (T ≤ 2)	36 (15.0)
T2 (2 < T ≤ 5)	162 (67.5)
T3 (T > 2)	42 (17.5)
N stage
N0	109 (45.4)
N1	66 (27.5)
N2	30 (12.5)
N3	35 (14.6)
Histological grade
I	40 (16.7)
II	141 (58.8)
III	59 (24.6)
ER status a
Positive	106 (44.2)
Negative	134 (55.8)
HER2 gene b
Amplification	51 (21.3)
Non-amplification	189 (78.7)

^aER was determined by immunohistochemical staining according to guideline [27];

^bHER2 gene was determined by fluorescent in-situ hybridization (FISH) according to guideline [28].

T: tumor; N: node; ER: estrogen receptor; HER2: human epidermal growth factor receptor-2.