Abstract
▪ Abstract Recent advances in cell isolation techniques have greatly enhanced our understanding of the phenotype and function of hematopoietic stem cells in mice and humans. Many clinical studies have established the efficacy of using peripheral blood stem cells to supplement or replace bone marrow transplantation as a therapeutic modality for several types of malignancies. This new approach to malignant disease management, perhaps in combination with posttransplantation cytokine therapy, promises to completely alter the clinical course of bone marrow transplantation.