The spice cardamon could hold the key to tackling aggressive types of breast cancer, according to new research.

A natural compound called cardamonin found in the spice kills cancer cells and prevents them from flying under the immune system's radar, say scientists at the Florida A&M University.

Around 10 to 15 percent of breast cancers are known as "triple-negative" which are more aggressive and deadly.

They are also difficult to treat with hormone-based therapies used for other types of breast cancer.