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While the cellular origin of cancer remains unresolved, two long-time competing hypotheses, namely the “stem cell theory” and the “de-differentiation theory” of cancer, have enticed new interest because of recent advances in stem cell research and molecular oncology. It has long been noted that the disciplines of developmental biology and oncology share interests in common factors, such as genetic/environmental and dietary factors, which are associated with teratogenesis and carcinogenesis. The ideas that cancer is a “disease of cell differentiation”, a “stem cell disease” and “oncogeny as partially-blocked ontogeny” depend on the original target cell, that ultimately leads to cancer, being an adult stem cell. Even though each tumor contains genotypic/phenotypic–diverse cells, they all seem to have originated from a single “cancer stem cell”, in that they are clonally-derived.
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