Patient’s characteristics

CharacterEstrogen levelsSubject no.
NormalHigh
Age mean (years)39.5
ER-positive breast cancer26*** (29.2%)4 (4.5%)30
ER-negative breast cancer11 (9.23%)18*** (20.2%)29
Control25*** (32.30%)5 (5.6%)30
Total no.62 (69.7%)27 (30.3%)89

* A significant difference between subject groups with the same estrogen level at P < 0.05; ** A significant difference between estrogen levels within the same subject group at P < 0.05