There are many different types of breast cancer - some genetic - but all (I understand), to be hormonal.
As a breast cancer survivor - I can state emphatically that I had no abortions or miscarriages. However, I am still convinced that those pills that we were encouraged to consume in the 60’s to dry up breast milk may have been culpable. Formula was deemed as healthy by physicians and convenient in maternity hospitals.
Interesting thought. I’d forgotten about those pills they gave to dry up milk.