I wish I had links at my fingertips but don’t, but here is my recollection on the topic.
The connection between abortions and breast cancer is real; it is increased the earlier a woman has had an abortion, as well as the number. Also it is increased if a woman had an abortion before carrying a pregnancy to term. From what I remember, because the breasts undergo hormonal changes very early in the pregnancy, the abortion, unlike a nature-caused miscarriage, which are not allowed to continue normally. The hormonal changes involve increase in breast tissue including growth of the milk ducts or glands, and when abruptly stopped in an abortion, can cause cancer. I do not remember exact mechanisms involved.
Feminists and pro-abortion people really, really hate these studies and bury them as much as they can.
The more recent articles I came across in this search call that into question. I refer you to this study, in Archives of Internal Medicine, and the ACOG committee statement here , and the National Cancer Institute statement. There are similar statements from Cancer.org, etc. I thought I had read something more recent that did affirm the link, but I can't find anything like that now. Given that, I must regard it as unproven and questionable.
There was definitely an article in the British Medical Journal about it, which I think (don’t quote me) got picked up by either Nature or Sci American.
Went through this years issues of the BMJ, not there, will dig through 07 to 10 in the morning. Tis long past my bed time here!
Thank you for that supporting information.
I have heard that theory as well. It seems reasonable, imho.