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Equine malignant lymphomas: morphologic and immunohistochemical classification
1Poultry Microbiological Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Athens, GA 30604-5677, USA.
Veterinary Pathology
|July 31, 1998
Summary
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:
- 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.