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Cancer cells exhibit a mutator phenotype

L A Loeb1

  • 1Joseph Gottstein Memorial Cancer Research Laboratory, Department of Pathology, University of Washington, Seattle 98195-7705, USA.

Advances in Cancer Research
|October 24, 1997
PubMed
Summary

Cancer cells exhibit a mutator phenotype, leading to rapid mutation accumulation. This accelerates tumor development and highlights the importance of understanding mutagenesis for cancer prevention strategies.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Human tumors display a high mutation burden inconsistent with normal somatic cell mutation rates.
  • This suggests an underlying mutator phenotype driving genomic instability in cancer.

Purpose of the Study:

  • To review the concept and evidence supporting a mutator phenotype in human cancer.
  • To explore the implications of this phenotype for cancer development and prevention.

Main Methods:

  • Review of existing literature on cancer genetics and mutagenesis.
  • Analysis of data on somatic mutations in human tumors, particularly in repetitive sequences.
  • Examination of microsatellite instability in cancer cell lines and its correlation with mutation frequency.

Main Results:

  • The high number of mutations in tumors supports the existence of an early-onset mutator phenotype.
  • Evidence includes extensive somatic mutations in repetitive DNA sequences within human tumors.
  • Microsatellite instability in cell lines correlates with increased mutation rates in crucial genes.

Conclusions:

  • A mutator phenotype is a key factor in cancer development, interacting with clonal selection to promote proliferation.
  • Understanding the mechanisms of mutagenesis in cancer is crucial for developing effective prevention strategies.
  • Slowing the mutation rate could significantly reduce cancer mortality.

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