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Epithelioid sarcoma. An immunohistochemical study.

J C Manivel, M R Wick, L P Dehner

    American Journal of Clinical Pathology
    |March 1, 1987
    PubMed
    Summary
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    Epithelioid sarcoma exhibits epithelial markers, challenging its mesenchymal origin. Immunohistochemistry aids in distinguishing this neoplasm from other soft tissue tumors.

    Area of Science:

    • Surgical pathology
    • Oncology
    • Immunohistochemistry

    Background:

    • Epithelioid sarcoma is a rare soft tissue neoplasm with uncertain histogenesis.
    • Its phenotypic profile often mimics epithelial neoplasms, diverging from typical mesenchymal sarcomas.

    Purpose of the Study:

    • To investigate the immunohistochemical profile of epithelioid sarcoma.
    • To differentiate epithelioid sarcoma from other neoplastic and granulomatous processes.

    Main Methods:

    • Immunohistochemical analysis of 14 epithelioid sarcoma cases.
    • Reactions assessed using antibodies against cytokeratin, epithelial membrane antigen, vimentin, leukocyte common antigen, myoglobin, and Factor VIII-related antigen.

    Main Results:

    Related Experiment Videos

  • All 14 epithelioid sarcoma cases reacted positively for cytokeratin, epithelial membrane antigen, and vimentin.
  • No cases showed reactivity for leukocyte common antigen, myoglobin, or Factor VIII-related antigen.
  • The observed phenotype aligns more with epithelial neoplasms than mesenchymal tumors.

    • Conclusions:

    • Epithelioid sarcoma displays phenotypic characteristics suggestive of epithelial differentiation.
    • This supports potential origins as a deep soft tissue carcinoma or a mesenchymally derived neoplasm with epithelial potential.
    • Immunohistochemistry is valuable for differential diagnosis when light and electron microscopy findings are equivocal.