Daclizumab, a humanized monoclonal antibody, binds CD25 and blocks formation of the IL-2 receptor on T cells. A study of daclizumab as acute graft-versus- host disease (GVHD) prophylaxis after unrelated bone marrow transplantation was conducted before the importance of CD25+FOXP3+ regulatory T cells (Tregs) was recognized. Tregs can abrogate the onset of GVHD. The relation between Tregs and a graft-versus-malignancy effect is not fully understood….. Continue Reading