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Related Concept Videos

Cancer Stem Cells and Tumor Maintenance02:40

Cancer Stem Cells and Tumor Maintenance

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Early diagnosis and treatment can often cure cancer. However, even with treatment, residual cells called cancer stem cells (CSC) might remain, often causing tumor recurrence. These cancer stem cells possess the potential for self-renewal and multi-lineage differentiation and are often responsible for the therapeutic resistance displayed in most cancers.
Cancer stem cells are thought to originate from tissue-specific normal stem cells or progenitor cells. The normal stem cells usually reside in...
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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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Metastasis02:30

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Metastasis is the spread of cancer cells from the original site to distant locations in the body. Cancer cells can spread via blood vessels (hematogenous) as well as lymph vessels in the body.
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Metastatic dormancy: a complex network between cancer stem cells and their microenvironment.

Anne-Marie Bleau1, Alice Agliano2, Leyre Larzabal1

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Cancer cells can enter dormancy, a quiescent state, which is crucial for metastasis. Cancer stem cells (CSCs) are linked to dormancy and therapy resistance, potentially driving metastatic recurrence.

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Area of Science:

  • Oncology
  • Cancer Biology
  • Cellular Biology

Background:

  • Metastasis is the primary threat in cancer progression, often occurring years after initial tumor detection.
  • Cellular dormancy, a quiescent state of disseminated tumor cells (DTCs) in remote organs, is a critical rate-limiting step in metastasis.

Purpose of the Study:

  • To review the molecular mechanisms underlying tumor dormancy, focusing on cellular quiescence and the tumor microenvironment.
  • To explore the link between the cancer stem cell (CSC) theory and the processes of dormancy and metastasis.
  • To discuss the role of the microenvironment in regulating DTC fate and the potential application of CSC theory to metastasis initiation.

Main Methods:

  • Comprehensive review of existing published literature on tumor dormancy, CSCs, and metastasis.
  • Analysis of molecular mechanisms including cellular quiescence, tumor microenvironment interactions, and the angiogenic switch.
  • Investigation into the clinical relevance of circulating tumor cells (CTCs) and new identification technologies.

Main Results:

  • Evidence suggests a strong connection between cancer stem cells (CSCs) and tumor dormancy, contributing to minimal residual disease and therapy resistance.
  • The foreign microenvironment at a target tissue tightly regulates DTC fate through soluble factors, extracellular matrix modulation, and the angiogenic switch.
  • CSCs' inherent resistance to therapy may predispose them to dormancy and subsequent metastatic development.

Conclusions:

  • Tumor dormancy is a complex process involving cellular quiescence and intricate interactions within the tumor microenvironment.
  • The cancer stem cell theory provides a plausible framework for understanding dormancy, metastasis initiation, and therapeutic resistance.
  • Emerging technologies for CTC identification offer clinical insights into dormancy in metastatic cancer patients.