Yes, your statement is correct to a certain extent! Years and years ago before hormones and legalized abortion, breast cancer was known as an old spinster's and a nun's disease. They were largely the ones who got it. Of course, there's always the family history risk factor no matter even if you have children and other cases with no known risk factors.
I just remembered a recent study that said the Pill had a protective effect on the ovaries and this was a plus for women with a family history of ovarian cancer.
Yes, the Pill does provide protection from Ovarian cancer. Why? Because it blocks ovulation. Ovulation in a nutshell: An egg ripens within the ovary. A cyst (empty sac of cells of skin origin) forms around the egg which then migrates to the edge of the ovary. The cyst ruptures as it hits the side of the ovary expelling the egg into the area near the Fallopian tubes.
As a woman with two miscarriages, no live births and a family history of Ovarian cancer, I'm on the Pill simply for the protection it provides from Ovarian cancer. (PS I have a degree in biology)