Severe graft-versus-host disease is a lethal complication to allogeneic haemopoietic stem cell transplantation. This short review gives an overview of novel treatment strategies. Psoralen-enhanced UVA irradiation ( PUVA), extracorpoal PUVA, antibodies against IL-2 and TNF-alpha, thalidomide, octreotide, and mesenchymal stem cells are briefly discussed.