Abstract
The hypothesis that tumor comes from stem cells has been demonstrated in various human tumors.Cancer is not only a genetic disease but also a stem cell disease. It is a key to regeneration, mutations and recurrence of tumors that gene mutations affect stem cells, and then stem cells mutate to cancer stem cells. In an effort to review the evidence that liver cancer stem cells exist, two fundamental questions must be addressed. First, do hepatocellular carcinomas(HCC)arise from liver stem cells? Second, do HCCs contain cells that possess properties of cancer stem cells?More recently, there is a hypothesis that HCC arise from maturation arrest of liver stem cells. Analysis of the cells in HCC supports the presence of cells with stem-cell properties(ie, immortality, transplantability, and resistance to therapy). However, definitive markers for these putative cancer stem cells have not yet been found and a liver cancer stem cell has not been isolated. Key words: liver stem cells; liver cancer stem cells; hepatocellular carcinoma
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