Autologous bone marrow transplantation (ABMT) in the therapy of advanced malignant tumors of children and adolescents : C. Baumgartner1, E.A. Bleher2, G. Brun del Re3, U. Bucher3, R. Greiner2, A. Hirt4, P. Imbach1, A. Lüthy1, R. Odavic1, H.P. Wagner1,4. Dept of Pediatrics1, Clinic for Radiotherapy2 & Central Hematology Laboratory3, University Hospitals, Inselspital, 3010 Bern & Institute for Clinical and Experimental Cancer Research4, University of Bern, Tiefenauspital, 3004 Bern, Switzerland