Regis Peffault de Latour, MD, PhD of Saint Louis Hospital, Paris, France, talks about a project him and Boris Calmels have been working on to better the outcomes of transplantation at the 2017 annual meeting of the European Society for Blood and Marrow Transplantation (EBMT) in Marseille, France. He explains that they are building a biobank with annotated samples taken before and after transplantation that can be used for research. There are various types of post-transplant complications that this project is aiming to improve. One of these is the common issue of graft versus host disease (GVHD). Patients are sampled before transplantation, at the time of onset of acute and chronic GVHD and then one month after the onset of acute GVHD and 3 months after the onset of chronic GVHD. Collection of this data will be beneficial to improve understanding of which donors are best suited to the recipients and ultimately lead to better outcomes with a reduced risk of complications.