An emerging nanomedicine cancer treatment involving the injection of tiny nanoparticles carrying compounds that can poison cancerous cells has many benefits. This so-called photodynamic therapy (PDT) is non-toxic and it doesn’t involve invasive surgery. A team led by Jan van Hest from Eindhoven University of Technology in collaboration with researchers from China and the UK have designed a new PDT nanoparticle that attack cancerous cells in a novel way: they enter cells and shut down their power stations—their mitochondria—making the therapy much more effective. This new research has been published in Angewandte Chemie.