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Related Concept Videos

Metastasis02:30

Metastasis

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.
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...

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Related Experiment Video

Updated: Jun 20, 2026

Modelling Brain Metastasis: Standardized Analysis of Metastatic Colonization and Histological Growth Patterns by Stereotactic Intracortical Injection
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Logical structures extracted from metastasis experiments.

Yoshiro Maru1

  • 1Department of Pharmacology, Tokyo Womens Medical University, Shinjuku-ku, Tokyo, Japan. ymaru@research.twmu.ac.jp

Cancer Science
|August 28, 2009
PubMed
Summary

Stephen Paget

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • The "seed and soil" hypothesis, proposed in 1889, suggests metastasis depends on primary tumor origin and destination organs.
  • Current understanding relies on statistical observations from autopsy samples, lacking mechanistic insights.
  • Predicting metastatic sites remains a significant challenge in cancer research.

Purpose of the Study:

  • To establish a mechanistic theory for cancer metastasis using experimental evidence.
  • To investigate the role of pro-inflammatory Toll-like receptor 4 (TLR4) signaling in pre-metastatic niche formation.
  • To explore the potential for predicting metastatic organotropism.

Main Methods:

  • Experimental investigation into the mechanisms of metastasis.

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  • Focus on the role of endogenous ligands in stimulating Toll-like receptor 4 (TLR4) signaling.
  • Analysis of how TLR4 dysregulation contributes to the "pre-metastatic soil" microenvironment.

    • Main Results:

    • Proposed that dysregulation of pro-inflammatory Toll-like receptor 4 (TLR4) signaling establishes pre-metastatic soil.
    • Identified endogenous ligands as key stimulators of TLR4 in this process.
    • Demonstrated a potential link between TLR4 pathway activation and the preparation of distant organs for metastasis.

    Conclusions:

    • Dysregulated TLR4 signaling, activated by endogenous ligands, is proposed as a key mechanism in establishing pre-metastatic soil.
    • This mechanistic understanding could pave the way for predicting metastatic patterns.
    • Further research can build upon these findings to develop targeted therapeutic strategies against cancer metastasis.