device, for example, could precisely target cancer cells without affecting healthy cells -- the way chemotherapy and radiation do now. Drugs based on monoclonal antibodies -- engineered immune system proteins -- do this but the science could be expanded, the experts said. And liposomes, tiny capsules used to carry drugs, can be regarded as a "first generation" of nano-scale drug delivery devices. Dr. Janet Woodcock, acting deputy commissioner at the Food and Drug Administration, said her agency was gearing up to approve new nano-devices in medicine. --More 2337 Local Time 2037 GMT
