At present there is no good evidence that drinking a lot of green tea reduces a woman’s chances of getting breast cancer.
Although green tea is rich in antioxidants, and some laboratory studies have shown that its extracts can damage cancer cells, but these studies have only been done in laboratories and there is no clear evidence that it can be used to treat or prevent cancer.
Some studies have also looked at whether women who drink a lot of green tea are less likely to develop breast cancer than other women, but these have shown no difference in the breast cancer risk between the two groups.