- Patients who relapse with their initial disease or develop a second malignancy after related or unrelated donor allogeneic marrow transplantation with other initial diagnoses (such as but not limited to CLL, lymphoma, myeloma, juvenile CML, sarcoma, breast cancer) may also be included in this protocol. Patients will be eligible with or without other adjunct chemotherapy or radiation therapy. Post-transplant lymphomas (often referred to as EBV-associated lymphomas) will be eligible for donor leukocyte infusions on this protocol. Treatment with donor leukocytes under this protocol is restricted to malignant diseases only. Graft failure or relapse of non-malignant disorders is excluded from receiving donor leukocyte infusions on this protocol. Autologous transplant patients who relapse are not eligible for this protocol. Patients with malignant diseases amenable to other curative therapy are not eligible (i.e. skin cancers).