Ninety percent of all mesothelioma cases are caused by asbestos exposure. This cancer affects the protective lining that covers many of the body's internal organs known as the mesothelium. The areas of the lining most often affected are the lungs and abdomen.

The causes of breast cancer are not completely understood, although it is clear that a woman's age, gender and lifetime exposure to estrogen and her age at the time of her first childbirth can play an important role. Because no one knows exactly what causes breast cancer, there is absolutely no way to prevent it.