Dr. Love points to tumor dormancy. You treat somebody for breast cancer and then ten years later it comes back. It works because it changes the cell environment. She suspects a more complex gene environment interaction. As an example, she describes individual response to cholesterol.
Some people can eat all the fat they want and their cholesterol stays normal.
Other people look at a cheesecake across a crowded room and their cholesterol goes up. Likewise, there may be some people who cannot metabolize pesticides as well as others. Maybe there's something genetic that makes you more susceptible. People born with one copy of this gene do not develop the disease, but they have four times the normal risk of breast cancer. This gene is involved in the DNA repair of mutations caused by radiation.