Heart disease and cancer are the top two causes of death in the United States. About 630,000 Americans die from heart disease each year, and nearly 596,000 die from cancer. Annual deaths from either disease alone are about equal to the population of Las Vegas. Risk for both diseases increases with age, and a large proportion of people in the U.S. are over age 65. Many older people have both diseases, and that requires a special kind of expert to care for them.