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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
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Diffuse Small B-Cell Lymphoma: A High-Grade Malignancy.

Kelly L Hughes1, E J Ehrhart2, Emily D Rout1

  • 1Colorado State University, Fort Collins, CO, USA.

Veterinary Pathology
|January 19, 2021
PubMed
Summary
This summary is machine-generated.

Researchers identified a new subtype of canine lymphoma, diffuse small B-cell lymphoma (DSBCL). This form of lymphoma in dogs has a median survival of 140 days, distinct from diffuse large B-cell lymphoma (DLBCL).

Keywords:
dogsflow cytometrylymphoreticularlymphosarcomaoncologysurgical pathology

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Area of Science:

  • Veterinary Pathology
  • Canine Oncology
  • Hematopathology

Background:

  • Diffuse large B-cell lymphoma (DLBCL) is the most common canine lymphoma.
  • Other canine B-cell lymphomas are small-to-intermediate in size and often poorly characterized histologically.
  • Accurate classification is crucial for understanding prognosis and treatment.

Purpose of the Study:

  • To identify and characterize distinct histologic subtypes of small B-cell lymphoma in dogs.
  • To compare the clinical presentation and outcomes of a newly identified diffuse small B-cell lymphoma (DSBCL) with DLBCL.
  • To establish histopathology as the primary classification method for canine small B-cell lymphomas.

Main Methods:

  • Review of 47 cases of nodal small B-cell lymphoma diagnosed by flow cytometry and histopathology.
  • Histologic classification into marginal zone lymphoma, follicular lymphoma, and a novel diffuse form.
  • Clinical data and follow-up information collected for comparison with DLBCL cases.

Main Results:

  • Three histologic subtypes of small B-cell lymphoma were identified: marginal zone, follicular, and a consistent diffuse form (DSBCL).
  • DSBCL cases showed a median survival of 140 days.
  • Flow cytometry markers (CD21, MHC class II, CD25) did not differentiate DSBCL from other small B-cell lymphomas.

Conclusions:

  • Histopathology is the current gold standard for classifying canine small B-cell lymphomas.
  • DSBCL represents a distinct entity requiring further molecular characterization.
  • Understanding these subtypes is vital for advancing canine lymphoma research and patient care.