University of Wisconsin-Madison researchers have developed nanoparticles that, in the lab, can activate immune responses to cancer cells. If they are shown to work as well in the body as they do in the lab, the nanoparticles might provide an effective and more affordable way to fight cancer.
source https://www.lifetechnology.com/blogs/life-technology-science-news/cheap-nanoparticles-stimulate-immune-response-to-cancer-in-the-lab