I haven't read the studies, but a "link" seems very likely. As I recall, there's a link between Asian women in Asia and dramatically reduced rates of breast cancer, but not Americans of Asian descent and breast cancer. That leads people to speculate that it's either diet or environmental. The study that I read focused on diet.
As far as links go, I'd be willing to bet money that there's a link between poverty and breast cancer. There's probably a link between poverty and abortions, and there's probably a link between risky behavior and all three.
You'll know a link does not mean a cause. Please take a look at post #24. If you're honest, you'll admit that several of the behaviors that I pointed out is #24 are both more likely to be practiced by women who have abortions and are potential causes of an increased risk of breast cancer.
Ooops, I just read another of your posts. I see that you are denying a link. You said, "Hundreds of studies have looked for a link to environmental toxins, pollution, chemicals, diet and fat intake, and NOT ONE OF THESE STUDIES has found a positive link." I don't study this, but it took all of 5 minutes to find these.
Asian Link to Breast Cancer
Alcohol Link to Breast Cancer
Exercise Link to Breast Cancer
Exposure Link to Breast Cancer
An interesting statistical anomaly regarding poverty and breast cancer. Before the early 1970's, breast cancer occurred at a higher rate in white women. Black women at that time were at a lower risk. Starting in the 1970's, the rate of breast cancer among black females skyrocketed, and today it is higher than that of white women. Now, a logical person would have to ask, 'Why is that?' Before the late 60's and early 70's, birth control was expensive and abortion was clandestine and expensive. This meant that more women of means and connection (usually white) had access to them and black women (usually low income) did not. Planned Parenthood was the great equalizer. Abortion and the Pill became accessible to all, and especially promoted among the lower socioeconomic class. Breast cancer became an equal opportunity killer.
No one is saying that ALL breast cancer is due to the Pill and abortion. They are both significant risk factors however, and abortion is now considered on par with family history of the disease as a risk factor. The medical profession is already aware of the artificial hormonal link. Women are asked if they take the Pill or estrogen when they go in for a mammogram. Why? Because they know it increases the risk of cancer. Estrogen has now been declared a carcinogen. As for abortion, they know of the studies and the link. It's just a matter of time before the powers that be acknowledge what the medical community already knows. Medicine has become very political. Politicians have no business hijacking it for their personal agendas. People are dying.
No, it leads people to speculate that they take the pill, have less kids, breast feed less, and have more abortions, here than back home. Heck, Japan only legalized the pill within the last decade. It will be several years till the breast cancers there attributed to pill use surface.
All the links you point to, with the possible exception of the alcohol link (notice I did not mention alcohol) are weak links or not even statistically relevant. In other words, the studies are equivocal.
Such is not the case with abortion and the pill.