Table 1. Clinical characteristics of the study subjects (N = 219).

Age (year)	52.0 (46.0, 59.0)
Left breast cancer	112 (51.1%)
Right breast cancer	107 (48.9%)
Max diameter of cancer (cm)	2.2 (1.5, 3.0)
Invasive lobular carcinoma	9 (4.1%)
Invasive ductal carcinoma	210 (95.9%)
Axillary lymph node metastasis	91 (41.6%)
ER+	147 (67.1%)
PR+	143 (65.3%)
HER-2+	52 (23.7%)
Ki67	30.0% (15.0%, 50.0%)
Luminal A	39 (17.8%)
Luminal B	95 (43.4%)
HER-2 overexpression	53 (24.2%)
ER-, PR- and Her-2-	32 (14.6%)

Abbreviations: Continuous variables are presented as median (with interquartile range); categorical variables are presented as number (percentage). ER+, estrogen receptor positive; PR+, progesterone receptor positive; HER-2+, human epidermal growth factor receptor-2 positive; Ki67, Ki67 nuclear antigen.