American Association for Cancer Research, Clinical Cancer Research, 22(13), p. 6549-6554, 2007
DOI: 10.1158/1078-0432.ccr-07-1088
AACR Education book, 1(2008), p. 397-406
DOI: 10.1158/aacr.edb-ccr-07-1088
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Abstract An emerging concept in cancer biology is that a rare population of cancer stem cells exists among the heterogeneous cell mass that constitutes a tumor. This concept is best understood in human myeloid leukemia. Normal and malignant hematopoietic stem cell functions are defined by a common set of critical stemness genes that regulate self-renewal and developmental pathways. Several stemness factors, such as Notch or telomerase, show differential activation in normal hematopoietic versus leukemia stem cells. These differences could be exploited therapeutically even with drugs that are already in clinical use for the treatment of leukemia. The translation of novel and existing leukemic stem cell–directed therapies into clinical practice, however, will require changes in clinical trial design and the inclusion of stem cell biomarkers as correlative end points.