Christoph Schmid, MD, University of Augsburg, Augsburg, Germany, discusses the benefits of marrow-infiltrating lymphocytes (MILs) as a source for adoptive cellular therapy. Dr Schmid reports that due to the unique properties of bone marrow T-cells, mainly their interaction with their microenvironment, they are promising candidates for adoptive cellular therapy. This interview took place at the 2021 Relapse After HSCT² Workshop in New York, NY.