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Related Experiment Videos

Assessing sequential oncogene amplification in human breast cancer

L E Janocko1, J F Lucke, D W Groft

  • 1Laboratory of Cancer Cell Biology and Genetics, Allegheny-Singer Research Institute, Pittsburgh, PA 15212-4772, USA.

Cytometry
|September 1, 1995
PubMed
Summary

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This study suggests a specific order for oncogene amplification in breast cancer: c-myc, then HER-2/neu, then H-ras. Early amplification of JC-A was also observed, independent of other oncogenes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Amplification of c-myc, HER-2/neu, and H-ras oncogenes correlates with poor breast cancer prognosis.
  • Understanding the sequence of oncogene amplification may reveal critical pathways in breast cancer development.

Purpose of the Study:

  • To investigate a potential preferred sequence of amplification for c-myc, HER-2/neu, and H-ras in breast cancer.
  • To determine the amplification timing of a novel DNA fragment, JC-A, in relation to these oncogenes.

Main Methods:

  • Analysis of oncogene amplification frequencies and co-amplification patterns in 84 breast cancer samples.
  • Loglinear analysis to model the sequence of gene amplification.
  • Quantification of JC-A amplification in 61 breast cancer cases.

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Main Results:

  • A preferred amplification sequence was identified: c-myc followed by HER-2/neu, then H-ras.
  • JC-A amplification appeared to occur early in the process.
  • Loglinear analysis supported a model where JC-A amplification is independent of HER-2/neu and H-ras amplification, but can precede or follow c-myc amplification.

Conclusions:

  • The findings suggest a specific chronological order of oncogene amplification in breast cancer progression.
  • JC-A amplification may represent an early event in breast tumorigenesis, with its timing relative to c-myc being significant.