Table 1.

Summary of Demographic Characteristics

Characteristic	Number
No. of Participants	120
Age, Mean ± SD, years (Range)	53.3 ± 9.9 years (range, 32 ~ 87 years)
Menstruation State
Premenopausal women	34
Postmenopausal women	69
Perimenopausal women	17
Tumor size, Mean ± SD, cm	2.96 ± 1.38 cm
Tumor size
≤ 2 cm	32
> 2 cm	88
ER
positive	86
negative	34
PR
positive	53
negative	67
HER2
positive	47
negative	73
Ki67
low-proliferation	70
high-proliferation	50

Note. SD standard deviation, ER estrogen receptor, PR progesterone receptor, HER2 human epidermal growth factor receptor 2