“Contraception causes Breast Cancer is . . ...:”
Fairly well known/documented that abortion of a fetus, particularly of first pregnancy, can induce breast cancer because it interrupts a sensitive breast tissue physiological maturation process that prepares the mammary gland for its vital milk production function.
The Breast Cancer Prevention Institute has on their webpage on studies oninduced abortion causing breast cancer [versus miscarriage spontaneous abortion]:
http://bcpinstitute.org/FactSheets/BCPI-FactSheet-Epidemiol-studies.pdf
There are 70 total studies done: 55 showed that induced abortion caused breast cancer.
They also state that in their breast cancer prevention pamphlet:
On page 10 of their booklet Breast Cancer Risks and Prevention, they talk about how induced abortion causes breast cancer. They state that spontaneous abortion (miscarriage) is not a factor.
Webpage to this booklet is: