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Genomic instability in cancer.

S Rockwell1, J Yuan, S Peretz

  • 1Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT 06520-8040, USA.

Novartis Foundation Symposium
|December 1, 2001
PubMed
Summary
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Solid tumors exhibit abnormal microenvironments, including low pH and hypoxia, from their early development. These conditions drive genetic instability and tumor evolution, promoting more aggressive cancer phenotypes.

Area of Science:

  • Oncology
  • Cancer Biology
  • Genetics

Background:

  • Solid tumors possess abnormal vasculature and lymphatic systems, leading to inadequate perfusion.
  • This results in tumor regions with low pH, severe hypoxia, and nutrient deprivation, present from early microscopic stages.

Purpose of the Study:

  • To investigate the impact of solid tumor microenvironments on genetic alterations and tumor evolution.
  • To understand how hypoxia and acidity contribute to genomic instability and increased malignancy.

Main Methods:

  • Analysis of cytogenetic changes induced by acidic and hypoxic conditions.
  • Examination of gene expression and DNA repair mechanisms in tumor cells.
  • Assessment of selection pressures favoring cells with altered proliferation regulators.

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Main Results:

  • Exposure to acidic and hypoxic environments increases mutation frequencies and DNA repair deficits.
  • These conditions induce DNA overreplication, gene amplification, and chromosomal rearrangements.
  • Adverse microenvironments select for cells with defects in cell proliferation regulatory genes.

Conclusions:

  • Hypoxia and acidity in solid tumors are critical drivers of genomic instability and heterogeneity.
  • These microenvironmental factors foster the evolution of less malignant cells into more aggressive phenotypes.
  • Understanding these mechanisms is key to targeting tumor progression.