Researchers in the Jacks, Anderson, and Langer Labs report in the Proceedings of the National Academy of Sciences that they have successfully delivered nanoparticles carrying small RNA therapies in a clinically relevant mouse model of lung cancer to shrink tumors and slow their growth. They found that their nanoparticle treatment extended life just as well as a standard-care chemotherapy drug, and furthermore, that the combination therapy of the nanoparticles and the drug together prolonged life by about an additional 25 percent. “Small-RNA therapy holds great promise for cancer,” Jacks says. “It is widely appreciated that the major hurdle in this field is efficient delivery to solid tumors outside of the liver, and this work goes a long way in showing that this is achievable.”