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lüll Location, location, location: the cancer stem cell niche Sneddon JB; Werb ZCell Stem Cell 2007[Dec]; 1 (6): 607-11The existence of a stem cell niche, or physiological microenvironment, consisting of specialized cells that directly and indirectly participate in stem cell regulation has been verified for mammalian adult stem cells in the intestinal, neural, epidermal, and hematopoietic systems. In light of these findings, it has been proposed that a "cancer stem cell niche" also exists and that interactions with this tumor niche may specify a self-renewing population of tumor cells. We discuss emerging data that support the idea of a veritable cancer stem cell niche and propose several models for the relationship between cancer cells and their niches.|*Models, Biological[MESH]|Animals[MESH]|Cell Differentiation/physiology[MESH]|Cell Proliferation[MESH]|Humans[MESH]|Neoplastic Stem Cells/pathology/*physiology[MESH] |