Abstract
Recent evidence suggests that a subpopulation of cancer cells, cancer stem cells (CSCs), is responsible for tumor growth in colorectal cancer. However, the role of CSCs in colorectal cancer metastasis is unclear. Here, we identified a subpopulation of CD26(+) cells uniformly present in both the primary and metastatic tumors in colorectal cancer patients with liver metastasis. Furthermore, in patients without distant metastasis at the time of presentation, the presence of CD26(+) cells in their primary tumors predicted distant metastasis on follow-up. Isolated CD26(+) cells, but not CD26(-) cells, led to development of distant metastasis when injected into the mouse cecal wall. CD26(+) cells were also associated with enhanced invasiveness and chemoresistance. Our findings have uncovered a critical role of CSCs in metastatic progression of cancer. Furthermore, the ability to predict metastasis based on analysis of CSC subsets in the primary tumor may have important clinical implication as a selection criterion for adjuvant therapy.
Copyright 2010 Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Apoptosis / drug effects
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Apoptosis / genetics
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Biomarkers, Tumor / biosynthesis*
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Biomarkers, Tumor / genetics
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Carcinoma / diagnosis*
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Carcinoma / drug therapy
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Carcinoma / genetics
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Carcinoma / metabolism
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Carcinoma / physiopathology
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Carcinoma / secondary
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Cell Migration Assays
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Cell Transformation, Neoplastic / genetics
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Colorectal Neoplasms / diagnosis*
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Colorectal Neoplasms / drug therapy
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Colorectal Neoplasms / genetics
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Colorectal Neoplasms / metabolism
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Colorectal Neoplasms / pathology
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Colorectal Neoplasms / physiopathology
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Dipeptidyl Peptidase 4 / biosynthesis*
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Dipeptidyl Peptidase 4 / genetics
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Disease Progression
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Drug Resistance, Neoplasm / genetics
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Fluorouracil / pharmacology
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Follow-Up Studies
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Gene Expression Profiling
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Humans
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Liver Neoplasms / diagnosis*
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Liver Neoplasms / drug therapy
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Liver Neoplasms / genetics
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Liver Neoplasms / metabolism
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Liver Neoplasms / physiopathology
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Liver Neoplasms / secondary
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Mice
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Mice, SCID
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Neoplasm Invasiveness / genetics
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Neoplasm Transplantation
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Neoplastic Stem Cells / drug effects
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Neoplastic Stem Cells / metabolism*
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Neoplastic Stem Cells / pathology
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Organoplatinum Compounds / pharmacology
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Oxaliplatin
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Prognosis
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RNA, Small Interfering / genetics
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Tumor Burden / drug effects
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Tumor Burden / genetics
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Tumor Cells, Cultured
Substances
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Biomarkers, Tumor
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Organoplatinum Compounds
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RNA, Small Interfering
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Oxaliplatin
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Dipeptidyl Peptidase 4
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Fluorouracil