Vorinostat for Graft vs Host Disease Prevention in Children, Adolescents and Young Adults Undergoing Allogeneic Blood and Marrow Transplantation

All subjects will undergo allogeneic blood or marrow transplant (BMT) according to local site institutional practice. The preparative regimen will depend upon the subject's underlying disease, type of transplant, previous therapy and comorbidities. Stem cells can be from donors of bone marrow or peripheral blood stem cells.