It is an old myth that mayonnaise can cause cancer and there is no truth to it whatsoever. There are however certain foods which can help in the prevention of cancer because they have antioxidants. It is important to eat plenty of antioxidant rich foods in order to remain as healthy as possible.
Mayonnaise has no carcinogens or properties that could possibly cause cancer, even for those who consume a significant amount of it on a regular basis. There are popular myths of many foods supposedly causing cancer, though there is truth to very few of them.