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Abnormal cell cycle regulation in malignancy.

M Dictor1, M Ehinger, F Mertens

  • 1Department of Pathology, Lund University Hospital, Sweden.

American Journal of Clinical Pathology
|July 9, 1999
PubMed
Summary
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The cell cycle is regulated by phosphorylation events and checkpoints, with disruptions in cell cycle genes linked to cancer. Immunohistochemistry and Ki-67 are key for assessing protein expression and prognosis.

Area of Science:

  • Cell Biology
  • Molecular Oncology

Background:

  • The cell cycle comprises G1, S, G2, and M phases, regulated by phosphorylation events involving kinases, phosphatases, cyclins, and inhibitors.
  • Cell cycle checkpoints, such as late G1 and G2, prevent progression with unreplicated or damaged DNA.

Purpose of the Study:

  • To review the regulatory mechanisms of the cell cycle.
  • To discuss the role of cell cycle regulators in tumorigenesis.
  • To highlight methods for detecting alterations and assessing prognostic value.

Main Methods:

  • Review of cell cycle regulation and its link to cancer.
  • Discussion of molecular techniques for genomic alteration detection.
  • Emphasis on immunohistochemistry for protein expression analysis.

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Main Results:

  • Cell cycle progression is tightly controlled by phosphorylation and dephosphorylation events.
  • Alterations in cell cycle regulator genes, especially in the RB pathway, are implicated in various tumors.
  • Immunohistochemistry is the primary method for assessing regulatory protein levels.

Conclusions:

  • Dysregulation of cell cycle control is a hallmark of cancer.
  • Understanding these pathways is crucial for cancer diagnosis and prognosis.
  • Ki-67 is frequently used in multivariate analysis for prognostic assessment.