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Equine malignant lymphomas: morphologic and immunohistochemical classification

L C Kelley1, E A Mahaffey

  • 1Poultry Microbiological Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA 30604-5677, USA.

Veterinary Pathology
|July 31, 1998
PubMed
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This study analyzed 31 equine malignant lymphoma cases, finding most tumors contained both B and T lymphocytes. A novel T-cell-rich, large B-cell lymphoma subtype was identified in horses.

Area of Science:

  • Veterinary Pathology
  • Immunohistochemistry
  • Equine Neoplasia

Background:

  • Equine malignant lymphoma is a significant neoplastic disease in horses.
  • Understanding the immunophenotypic characteristics of these lymphomas is crucial for diagnosis and classification.

Purpose of the Study:

  • To characterize the cellular composition of equine malignant lymphomas.
  • To identify distinct subtypes based on B and T lymphocyte populations.

Main Methods:

  • Retrospective analysis of 31 equine malignant lymphoma cases.
  • Immunohistochemical staining using antibodies for B-cell (BLA.36, mb-1, B29) and T-cell (CD3, CD5) markers.
  • Evaluation of proliferation markers (Ki-67, PCNA).

Main Results:

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  • Most equine lymphomas exhibited a heterogeneous cell population, containing both B and T lymphocytes.
  • Twenty-four cases were diffuse lymphomas derived from B lymphocytes.
  • Eleven cases were classified as T-cell-rich, large B-cell lymphomas, a newly described subtype in horses.

Conclusions:

  • Equine malignant lymphomas are immunophenotypically diverse, often involving mixed B and T cell populations.
  • The identification of T-cell-rich, large B-cell lymphoma represents a significant advancement in equine lymphoma classification.