 Magnetic nanoparticles are gaining increasing attention due to their unique properties and potential applications and cancer diagnosis and treatment. They can be used as contrast agents for MRI as well as for targeted drug delivery systems. Furthermore, by combining them with other compounds such as chemotherapeutic drugs or RNA, novel multi-component nanoparticles can be created which exhibit enhanced performance and reduced side effects. This article was offered by Alexandra Pusta, Mihaila Turtez, Isabel Crescianescu, and others.