OUTLINE: This is a randomized study. Patients are stratified according to preparative regimen (high dose chemotherapy versus cyclophosphamide and total body radiotherapy). Patients are randomized into one of two treatment arms. All patients undergo a conditioning regimen consisting of cyclophosphamide daily on days -6 and -5 and total body radiotherapy on day -4 through -1, or high dose chemotherapy per transplantation protocol. Arm I: Patients receive oral captopril 2 to 3 times daily beginning on the first day of the conditioning regimen and continuing until day 100 post autologous bone marrow or stem cell transplantation. Arm II: Patients receive no captopril while undergoing conditioning therapy. Patients are followed at 6 months.