I GUARANTEE you this is going to be somehow connected to medicines and procedures which enabled her late-in-life pregnancies. Look out, pharmeceutical companies!
....thinking the very same thing....no doubt that John Edwards will be looking for a lawsuit against the doctor and/or hospital and/or drug company.
It can also be weight related. I not saying that to be ugly! I had a dear friend pass two years ago from cancer that initially started in her breast. Excess weight stores estrogen, and many types cancer are related to estrogen. My friend's was. She was overweight, and the doctors strongly suggested that she maintain a healthy diet. Once she was in remition, they put her on a hormone suppressing drug. She basically produced no estrogen. The diet thing was hard for her, and she never took it very seriously. The cancer returned in her liver.
There is no factual basis for your statement. And extensive research has been done on that topic.