- Regimen A: Patients with chronic myelogenous leukemia (CP1, AP/CP2) and other myeloproliferative disorders, myelodysplastic disorders, acute myelogenous leukemia (CR1), or multiple myeloma (not eligible to receive total body irradiation due to prior radiation) are treated with high dose busulfan and cyclophosphamide followed by allogeneic bone marrow transplantation (BMT). Patients receive oral busulfan every 6 hours on days -7 to -4 and cyclophosphamide IV over 1 hour on days -3 and -2. Allogeneic bone marrow is infused on day 0.