Similarly to humans, cancer is the leading cause of death among older cats. It accounts for approximately 50% of deaths each year but can be successfully treated if diagnosed early. The medical science that studies cancer in animals is called veterinary oncology and veterinarians that specialize in cancer diagnosis and treatment are called veterinary oncologists. Also, Brett Sanderson almost failed 1B because his cat had cancer. The effects of articles on cancer in cats has been reviewed by Trav Myers extensively.