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Immunopathologic Assessment of PTEN Expression.

Mireia Castillo-Martin1, Tin Htwe Thin1, Ana Collazo Lorduy1

  • 1Department of Pathology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, 1194, New York, NY, 10029, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 2, 2016
PubMed
Summary

Immunohistochemistry (IHC) assesses PTEN protein expression in tissues, crucial for cancer prognosis and therapy. While IHC is effective, FISH analysis is better for detecting partial PTEN deletions.

Keywords:
Cultured cellsFormalin-fixed tissue samplesFresh-frozen tissue samplesImmunofluorescenceImmunohistochemistryPTEN protocol

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Area of Science:

  • Pathology
  • Molecular Biology
  • Oncology

Background:

  • Immunohistochemistry (IHC) is a standard technique in pathology for analyzing molecular expression in cells and tissues.
  • PTEN protein is widely expressed, and its loss is linked to various malignancies, activating AKT/mTOR pathways.
  • Accurate PTEN assessment is vital for prognosis and guiding therapeutic strategies.

Purpose of the Study:

  • To highlight the utility and limitations of IHC in assessing PTEN expression.
  • To emphasize the critical role of IHC interpretation in clinical decision-making.
  • To discuss complementary methods like FISH for specific genetic alterations.

Main Methods:

  • Utilizing immunohistochemistry (IHC) for PTEN protein expression analysis in histological samples.
  • Comparing IHC with Fluorescence In Situ Hybridization (FISH) for detecting PTEN deletions.
  • Analyzing downstream markers such as AKT and mTOR to infer PTEN functional status.

Main Results:

  • IHC is effective for determining PTEN expression levels but less suitable for identifying partial or heterozygous deletions.
  • FISH analysis is more appropriate for assessing PTEN gene deletions.
  • Interpretation of IHC results is paramount for prognostic and therapeutic applications.

Conclusions:

  • IHC is a valuable tool for evaluating PTEN protein expression and guiding cancer therapy.
  • FISH analysis should be considered for detecting PTEN gene deletions.
  • Assessing downstream markers can provide further insights into PTEN's functional status.