With the first two fields of application in breast cancer and heart failure patients, the European research project EXPERT addresses two of the most pressing healthcare challenges in European society today. The 11 international partners from academia and industry collaborate to develop a platform-based delivery system for mRNA nanomedicine to tackle the bottlenecks that therapeutic mRNA application is currently facing. The complementary expertise of the partners spans the entire development track from nanoparticle design via Good Manufacturing Practice (GMP)-based production to clinical application. As proof-of-concept, the partners work towards a first clinical study focusing on immunotherapy for metastatic triple-negative breast cancer. The specific mRNAs would instruct patients' cells to produce proteins which activate immune cells and liberate tumour antigens. As a second field of application, EXPERT will investigate the use of mRNA for heart failure. Patients would receive a specific mRNA molecule helping to stimulate tissue regeneration in the heart without producing side effects elsewhere in the body. Besides the production of the mRNA therapeutics, the project seeks to identify new pathways of delivering the medication to the targeted cells of activity through nanocarrier materials designed to protect the mRNA payload from being destroyed by the human body's immune response. "Our vision is to clinically develop mRNA therapeutics and to overcome the main obstacles mRNA-based therapy approaches are facing on their way to the market," said Professor Raymond Schiffelers from Universitair Medisch Centrum Utrecht, Netherlands, who coordinates the project. "The EXPERT approach could make mRNAs available off-the-shelf enabling their use for more patients and different types of diseases." The EXPERT consortium comprises 11 international partners from The Netherlands, Belgium, Norway, Sweden, Spain, Hungary, Ireland, France, Germany, and Israel. On 24-25 October 2019, they all came together for the official project kick-off in Utrecht, Netherlands.