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Related Experiment Videos

p53 quantitative immunocytochemical analysis in breast carcinomas

C Charpin1, B DeVictor, L Andrac

  • 1Department of Pathology, Centre Hospitalo-Universitaire Timone, Marseille, France.

Human Pathology
|February 1, 1995
PubMed
Summary

p53 protein expression in breast cancer is best assessed using frozen sections and image analysis. Paraffin sections can lead to underestimation, impacting the understanding of p53

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Area of Science:

  • Oncology
  • Pathology
  • Molecular Biology

Background:

  • p53 protein is a critical tumor suppressor gene.
  • Accurate assessment of p53 expression is vital for breast cancer prognosis.
  • Standardization of immunohistochemical methods is crucial for reliable results.

Purpose of the Study:

  • To investigate the impact of tissue preparation methods on p53 expression detection in breast carcinomas.
  • To correlate p53 expression with various clinicopathological and molecular features.
  • To determine the optimal method for assessing p53's prognostic significance.

Main Methods:

  • Investigated 200 breast carcinomas using frozen and paraffin sections.
  • Employed p53 monoclonal antibody (PAb 1801) and streptavidin biotin peroxidase complex.

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  • Utilized densitometric analysis of digitized microscopic images for quantification.

    • Main Results:

    • p53 was detected in the nucleus of 48% of tumors.
    • Paraffin sections showed decreased p53 positivity and intensity compared to frozen sections (P < .01).
    • p53 expression correlated with high histological grade, absence of ER/PR, high Ki-67, and specific molecular markers.

    Conclusions:

    • Frozen sections with image analysis provide a more reliable assessment of p53 expression in breast cancer.
    • Paraffin embedding can lead to underestimation of p53 positivity.
    • Standardized protocols are essential for understanding the clinical relevance and prognostic significance of p53 in breast carcinomas.