I don't understand how just one thing can be implicated in any type of cancer. There are infinite variables depending on your lifestyle, and many things that have the potential to alter our hormone balance, which is a causative to some cancers.
Microwave cooking in plastics to name one, lots of plants have phyto estrogens that are usually self limiting but can be affective for another. A woman who has had an abortion is also at much higher risk for breast cancer.
Cancer, and especially breast cancer, is a big money maker.