I just wonder how they could be so certain that that proposed "sudden interrupted estrogen surge" mechanism is true when there haven't been studies confirming any link between miscarriages and breast cancer.

(If it were true, I don't think there COUDN'T be a link between miscarriages and breast cancer.)

And I wonder how they arrived at the conclusion that this could be the ONLY mechanism (induced abortion leads to sudden interrupted estrogen surge leads to breast cancer) by which there would be an increase in breast cancer in women.

There are, in fact, other scenarios that can lead to an increase in breast cancer incidence in women.

Call me a skeptic...