Too much estrogen produces the overgrowth of cells which can increase the chances of cancer. Luckily, if the tumor is still only in the breast, the five year survival rate is over 99%.

Chapters:
0:00 Intro
0:48 The five year survival rate is only 80% for breast cancer
2:03 Estrogen can be a carcinogen for breast cancer.
3:41 “There’s a gene that increases the risk of breast cancer by 80%.”
5:26 1 in 8 American women will get breast cancer in their lifetime.
6:47 Overtime
7:14 Outro