Mounting evidences indicate that leukemic cells in patients with acute myeloid leukemia (AML) are derived from leukemia stem cells (LSC). In analogy to normal hematopoietic stem cells (HSC), LSC remain mostly dormant and are hence resistant to conventional chemotherapy. Residual, physiological HSC exist alongside with LSC, with heterogeneous dominance of LSC over HSC in individual patients. We have devised a flow cytometric method for the identification and separation of these two stem cell populations based on surface antigen markers such as CD34, CD38, lineage aberrant markers, and aldehyde dehydrogenase (ALDH) enzyme activity.
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