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Related Experiment Videos

Different proliferative patterns characterize different preinvasive breast lesions.

P Viacava1, A G Naccarato, G Bevilacqua

  • 1Department of Oncology, Division of Pathology, University of Pisa, Italy.

The Journal of Pathology
|July 27, 1999
PubMed
Summary
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Investigating cell-cycle proteins Ki-67/MIB-1, bcl-2, and p53 in preinvasive breast lesions reveals distinct immunoprofiles. These profiles suggest early differences in proliferation and apoptosis control, potentially indicating different origins or progression pathways for breast cancer.

Area of Science:

  • Oncology
  • Cell Biology
  • Pathology

Background:

  • The early stages of breast cancer development involve complex cellular changes.
  • Understanding the molecular markers associated with these changes is crucial for early detection and intervention.
  • Cell-cycle associated proteins like Ki-67/MIB-1, bcl-2, and p53 play significant roles in cell proliferation and apoptosis.

Purpose of the Study:

  • To investigate the expression patterns of Ki-67/MIB-1, bcl-2, and p53 in various preinvasive breast lesions and adjacent normal tissue.
  • To correlate these marker expressions with different grades of breast lesions and normal breast parenchyma.
  • To explore the potential implications of these immunoprofiles on the understanding of early neoplastic progression and lesion origin.

Main Methods:

Related Experiment Videos

  • An extensive immunohistochemical analysis was performed on a comprehensive set of preinvasive breast lesions, including florid ductal hyperplasias (FDHs), atypical ductal hyperplasias (ADHs), intraductal carcinomas (WDICs, IDICs, PDICs), and lobular lesions (ALHs, LCIS).
  • Expression levels of Ki-67/MIB-1 (proliferation marker), bcl-2 (anti-apoptotic marker), and p53 (tumor suppressor protein) were evaluated.
  • Normal breast ducts and lobules were also analyzed to serve as a baseline and for comparison.

    • Main Results:

    • FDHs, ADHs, well-differentiated intraductal carcinomas (WDICs), and lobular lesions exhibited low proliferation (Ki-67/MIB-1), bcl-2 positivity, and p53 negativity.
    • Poorly differentiated intraductal carcinomas (PDICs) showed high proliferation, with significant p53 positivity (85%) and low bcl-2 positivity (7%).
    • Intermediately differentiated intraductal carcinomas (IDICs) presented high proliferation (50%), bcl-2 expression (70%), and p53 positivity (30%), potentially linking hyperplastic/WDIC to PDIC stages.
    • Normal ducts and lobules predominantly showed low proliferation and diffuse bcl-2 expression, with no p53 positivity.

    Conclusions:

    • The distinct immunoprofiles of preinvasive breast lesions suggest that differences in proliferation and apoptosis control may be present from the earliest stages.
    • Intermediately differentiated intraductal carcinomas (IDICs) appear to bridge the gap between hyperplastic lesions/WDIC and poorly differentiated intraductal carcinomas (PDICs) based on their marker expression.
    • The findings support two hypotheses: either modulation of apoptosis control and proliferation occurs during neoplastic progression, or distinct immunoprofiles reflect different origins in the normal breast parenchyma.