Stem cells are functionally defined as long-lived cells that can both self-renew and differentiate into multiple cell types. Embryonic stem cells, considered totipotent cells, give rise to all embryonic tissue layers and, consequently, all tissue types. Hematologists/oncologists are perhaps most familiar with hematopoietic stem cells (HSCs): the single pluripotent cell that can give rise to all lymphoid, myeloid and erythroid cell lineages, and repopulate an ablated hematopoietic system [1, 2]. Similar paradigms appear to apply in normal nonhematopoietic tissues as well, including the liver, intestinal epithelium, enodothlium, skeletal muscle and brain. Likewise, using the same framework, cancer biologists have identified cells within a variety of tumors with cancer stem cell properties: rare cells that give rise to tumors, have the capacity to sustain a malignancy and, not surprisingly, share many features in common with tissue specific stem cells [3–5]. These developments create a new sense of urgency to more completely understand the biology of stem cells and their microenvironment: stem cell therapies may become standard outside the subspecialty of hematology, and across disciplines in the emerging field of regenerative medicine, and key molecular differences between normal stem cells and cancer stem cells may emerge as ideal targets for cancer therapy. The goal of this chapter is to provide an overview of current stem cell biology in this context, and its relationship to hematopoietic stem cell transplantation (HSCT).
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Hexner, E.O., Emerson, S.G. (2008). Stem Cell Biology. In: Soiffer, R.J. (eds) Hematopoietic Stem Cell Transplantation. Contemporary Hematology. Humana Press. https://doi.org/10.1007/978-1-59745-438-4_1
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