POLYSFERA is a collaborative R&D project aimed at developing new forms of release of antitumour drugs. These systems are based on polymeric particles developed through nanotechnology. The project will last for 4 years and the following partners will participate: PharmaMar (a pharmaceutical company and project leader), Ecopol Tech (a polymers company), the Parc Cientific de Barcelona and the Hospital Universitario Vall d’Hebron.