Fermin Sanchez-Guijo, MD, PhD, of Hospital ClÃnico Universitario de Salamanca, Salmanca, Spain, speaks to us about the role of mesenchymal stem cells in hematopoietic progenitor cell engraftment and the associated risks with this treatment, namely GvHD. This interview was recorded at the 2018 European Group for Blood and Marrow Transplantation (EBMT) Annual Meeting, held in Lisbon, Portugal.