Regulatory T cells (Tregs) can prevent graft-vs.-host disease as induced by the infusion of donor lymphocytes to cancer patients, but often they also suppress therapeutic antitumor immunity. We discuss an exception to this phenomenon, exemplifying how the milieu provided by the bone marrow may neutralize Tregs to allow local immune responses against cancer.
Keywords: bone marrow; graft-vs.-host disease; graft-vs.-tumor; lymphocyte infusion; regulatory T cell.