PROTOCOL OUTLINE: This is a multicenter study. Patients receive oral prednisone on days 0-10. Beginning on day 1, patients undergoing autologous peripheral blood stem cell (PBSC) transplantation receive filgrastim (G-CSF) subcutaneously daily until leukapheresis is completed. Leukapheresis begins on approximately day 4 and continues until adequate CD34+ PBSC are collected.
PBSC are collected from syngeneic donors in a similar manner. Patients undergo total-body irradiation twice daily on days -5 and -4. Patients receive cyclophosphamide IV on days -3 and -2 and anti-thymocyte globulin IV on days -5, -3, -1, 1, 3, and 5. Patients undergo autologous or syngeneic PBSC transplantation on day 0. Following PBSC transplantation, patients receive oral prednisone on days 7-30 and G-CSF IV daily beginning on day 0 and continuing until blood counts recover.
Patients are followed at 30, 80, and 90 days, monthly for 6 months, and then at 1 and 2 years.