- Patients must have received allotransplant (related or unrelated donor) for hematologic malignancies and have disease progression with a component of solid-phase disease. Eligible diagnoses will include any acute or chronic leukemia with a solid-phase component, Hodgkin's lymphoma, any non-Hodgkin's lymphoma, including mantle cell lymphoma, multiple myeloma. Pathology slides from patients pretransplant diagnoses will be reviewed by National Cancer Institute (NCI)/Center for Cancer Research (CCR) Department of Pathology.