Welsh researchers are working on developing ultrasmall nanoparticles to tackle breast and prostate cancers more effectively. It could allow higher doses of more toxic drugs to be used without fear that widespread damage to tissues will be caused. The work is being carried out by the recently established Centre for Polymer Therapeutics established within the Welsh school of Pharmacy at Cardiff under the direction of Professor Ruth Duncan. It specializes in the use of so-called designer molecules made up from polymers which are chemicals constructed of long chains of molecules. The active drug is carried within the nanoparticle.