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Related Experiment Videos

Granular cell tumor: an immunohistochemical study

A Cavaliere1, A Sidoni, I Ferri

  • 1Institute of Pathological Anatomy and Histology, Perugia University, Italy.

Tumori
|June 30, 1994
PubMed
Summary

This study investigates the origin of granular cell tumors, finding they express markers of both neuroectodermal and macrophage origins. This suggests a dual immunophenotypic profile reflecting their complex cellular characteristics.

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Area of Science:

  • Oncology
  • Immunohistochemistry
  • Cell Biology

Background:

  • Granular cell tumors (GCTs) are typically benign neoplasms with uncertain histogenesis.
  • Previous studies suggested a Schwann cell origin based on immunohistochemical and ultrastructural findings.
  • Recent observations indicated GCTs are positive for PG-M1, an anti-macrophage antibody, prompting further investigation.

Purpose of the Study:

  • To investigate the immunophenotypic profile of granular cell tumors.
  • To explore the potential dual origin of GCTs suggested by macrophage marker positivity.

Main Methods:

  • Analyzed 11 granular cell tumors using a panel of 20 antibodies (13 monoclonal, 7 polyclonal).
  • Performed immunohistochemical analysis to assess protein expression.

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Main Results:

  • Consistent diffuse positivity for S-100 protein, neuron-specific enolase, vimentin, KP1, and PG-M1 was observed in all cases.
  • Occasional focal positivity for alpha-1-antitrypsin, alpha-1-antichymotrypsin, and lysozyme was noted.

Conclusions:

  • The observed immunophenotype suggests a neuroectodermal origin, supported by S-100 protein, neuron-specific enolase, and vimentin positivity.
  • The findings also indicate phagocytic activity within tumor cells, evidenced by KP1 and PG-M1 positivity and the presence of phagolysosomes.