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The invasive phenotypes.

M M Mareel¹, F M Van Roy, P De Baetselier

¹Department of Radiotherapy and Nuclear Medicine, State University of Ghent, Belgium.

Cancer Metastasis Reviews

|July 1, 1990

Summary

Cancer metastasis is determined by invasive (I+) and non-invasive (I-) phenotypes. Understanding the balance between these pathways is key to controlling tumor invasion and growth.

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Area of Science:

Cell Biology
Cancer Research
Metastasis

Background:

Cancer metastasis is a complex process driven by the expression of invasive (I+) or non-invasive (I-) phenotypes.
The interplay between invasion (I) and uncontrolled growth (G) phenotypes dictates cellular behavior in various conditions, including neoplastic diseases.
The sequence of acquiring these phenotypes during tumor development remains unclear, despite the G+I+M+ combination correlating with full malignancy.

Purpose of the Study:

To elucidate the regulatory mechanisms of invasive phenotypes within the tumor-host ecosystem.
To identify potential molecular markers associated with cellular invasion.
To investigate the balance between invasive (I+) and non-invasive (I-) pathways in cancer progression.

Main Methods:

Analysis of invasive (I+) and non-invasive (I-) phenotypes in cellular behavior.
Assessment of uncontrolled growth (G+) and its absence (G-) in conjunction with invasion.
Examination of morphological correlates of invasive cell activities within the tumor-host ecosystem.
Investigation of candidate molecular markers, including hydrolase activity regulators, cell-cell adhesion molecules, and cell surface receptors.

Main Results:

Conditional invasion indicates that temporary expression of the I+ phenotype can drive metastasis.
The tumor-host ecosystem plays a crucial role in regulating I phenotypes.
Invasive functions include motility, altered cell adhesion, and extracellular matrix degradation.
Oncogene activation primarily promotes G+ expression, amplifying I and M phenotypes.

Conclusions:

Invasion is hypothesized to depend on the balance between I+ and I- pathways.
Both I+ and I- pathways are sensitive to stimulation and inhibition.
Understanding these pathways and their regulation is critical for targeting cancer metastasis.

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