ABSTRACT
Increasing evidence suggests that many, perhaps all solid tumors contain a subset
of cells that possess functional properties similar to the normal tissue stem cells,
including self-renewal, unlimited proliferative capacity, and pluripotency. The hierarchical
cancer model that places a cancer stem cell (CSC) population at the apex of tumor
formation is based on this notion. The cancer stem cell hypothesis posits that CSCs
are responsible not only for tumor initiation, but also generation of metastasis and
local recurrence after therapy. Current definitions of the CSC are based only on functional
properties regardless of potential cellular origin. Histopathology investigations
of chronic liver diseases and experimental studies support the existence of CSCs in
liver cancer. In particular, recent advances in microarray technologies utilizing
integrative comparative genomic analysis of human hepatocellular carcinoma specimens,
cancer cell lines, and transgenic models establish the molecular similarities between
CSC and normal tissue stem cells and highlight the importance of CSC for the prognosis
of liver cancer patients. The results have also uncovered the key “stemness” and oncogenic
pathways frequently disrupted during hepatocarcinogenesis providing the basis for
identifying novel therapeutic targets against CSC.
KEYWORDS
Hepatocellular carcinoma - stem/ progenitor cells - oval cells - comparative functional
genomics - cancer stem cells - hepatocarcinogenesis
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Snorri S ThorgeirssonM.D. Ph.D.
Laboratory of Experimental Carcinogenesis (LEC), Center for Cancer Research
National Cancer Institute, NIH, 37 Convent Drive, Room 4146, Bethesda, MD 20892
Email: snorri_thorgeirsson@nih.gov