Now we are three

Working in the healthcare industry, I am always drawn to articles and studies that involve drugs or diseases, etc. Here’s one that says if you have migraines you are less likely to get breast cancer. One of those “suffer now but be rewarded later” situations. Superb. What happens if you stop getting migraines (ie: I haven’t had one in more than a year)? Or, what if your migraines are caused by the pill/related to taking the pill? Are you still less likely to get breast cancer?