According to researchers at Case Western Reserve University, a single gene known as HEXIM1 has been shown to suppress breast cancer AND increase heart health!
Heart disease and cancer are the leading causes of death in the United States. The gene increases the number of blood vessels within the heart, as well as their density and supresses the growth of breast cancer tumors.
Furthermore, the gene showed increased efficiency in mice even without exercise. So basically, the mice had the heart health of an athlete without the exercise! As described in the article, many cancer treatments have damaging effects on the heart, so a cancer treatment that simultaneously increases heart health would be monumental.
Further research is being conducted to determine if treatment for heart attacks is plausible as well.