Increasing mixed chimerism defines a high-risk group of childhood acute myelogenous leukemia patients after allogeneic stem cell transplantation where pre-emptive immunotherapy may be effective. - Bader,P.; Kreyenberg,H.; Hoelle,W.; Dueckers,G.; Kremens,B.; Dilloo,D.; Sykora,K.W.; Niemeyer,C.; Reinhardt,D.; Vormoor,J.; Gruhn,B.; Lang,P.; et al. (Bone Marrow Transplant, 2004)