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Related Experiment Videos

Cyclin E, a potential prognostic marker for breast cancer

K Keyomarsi1, N O'Leary, G Molnar

  • 1Division of Cell Growth and Regulation, Dana-Farber Cancer Institute, Boston, Massachusetts.

Cancer Research
|January 15, 1994
PubMed
Summary

Cancer involves genetic changes affecting cell cycle proteins. This study found significant cyclin E alterations in various cancers, suggesting its potential as a prognostic marker for breast cancer progression.

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Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Cycle Regulation

Background:

  • Cancer arises from genetic alterations that disrupt normal tissue development and promote tumor cell growth.
  • Cell cycle deregulation, often due to altered protein production (e.g., tumor suppressors, oncogenes), drives uncontrolled proliferation.
  • A universal genetic alteration common to all cancers has not been identified.

Purpose of the Study:

  • To investigate alterations in cyclin E protein production in various human malignancies.
  • To determine if cyclin E alterations are specific to tumor tissue compared to normal tissue.
  • To evaluate the correlation between cyclin E expression changes and tumor stage/grade in breast cancer.

Main Methods:

  • Analysis of surgical specimens from patients with diverse cancers, including breast cancer, other solid tumors, and lymphatic leukemia.

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  • Quantitative and qualitative assessment of cyclin E protein levels.
  • Correlation analysis of cyclin E alterations with S-phase fraction, tumor stage, and tumor grade.

    • Main Results:

    • Severe quantitative and qualitative alterations in cyclin E protein production were observed in breast cancers, other solid tumors, and malignant lymphocytes.
    • These cyclin E alterations were independent of the S-phase fraction, indicating a fundamental difference between normal and tumor tissues.
    • In breast cancer, cyclin E expression alterations worsened with increasing tumor stage and grade.

    Conclusions:

    • Altered cyclin E protein production is a significant characteristic of various cancers, distinguishing tumor tissue from normal tissue.
    • Cyclin E alterations represent a fundamental aspect of cancer biology, linked to cell cycle deregulation.
    • Cyclin E shows promise as a novel prognostic marker for breast cancer, correlating with disease progression.