Patients with high-risk hematological tumors can be cured by allogeneic hematopoietic stem cell transplantation (HSCT). However, the main causes of failure of HSCT are infections, tumor relapse and over-shooting immune responses of the donor T cells to healthy cells and tissues of the patient or graft-versus host disease (GvHD). Therefore, this treatment is still associated with a high morbidity a ...