In tests in animals, injecting genetically modified bacteria shrank tumours and triggered a strong immune response that prevented cancers spreading Source: https://www.newscientist.com/article/2196986-spread-of-cancers-halted-by-smart-bacteria-that-trigger-immune-attack/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home