Via PhysOrg.com, a look at yet another of the many approaches to a targeted cancer therapy: "In their study, the investigators developed a system containing two different nanomaterials that can be injected into the bloodstream. One nanomaterial was designed to find and adhere to tumors in mice and then sensitize tumor cells for the second nanoparticle, which kills the tumors. These scientists and others had previously designed nanometer-sized devices to attach to diseased cells or deliver drugs specifically to the diseased cells while ignoring healthy cells, but the functions of those devices, the researchers discovered, often conflicted with one another. ... For example, a nanoparticle that is engineered to circulate through a cancer patient's body for a long period of time is more likely to encounter a tumor, However, that nanoparticle may not be able to stick to tumor cells once it finds them. Likewise, a particle that is engineered to adhere tightly to tumors may not be able to circulate in the body long enough to encounter one in the first place. ... the scientists demonstrated in their experiments that a tumor growing in a mouse can be arrested and then shrunk."