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Feline progressive histiocytosis
1Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California at Davis, Davis, CA 95616, USA. vkaffolter@ucdavis.edu
Veterinary Pathology
|September 13, 2006
Summary
Feline progressive histiocytosis (FPH) is a skin disease in cats, likely originating from dendritic cells (DC). This initially indolent neoplasm progresses slowly, potentially affecting internal organs in later stages.
Area of Science:
- Veterinary Pathology
- Dermatology
- Oncology
Background:
- Histiocytic proliferative diseases encompass reactive and neoplastic conditions involving dendritic cells (DC) or macrophages.
- While documented in humans and dogs, histiocytic proliferations remain poorly characterized in cats.
- Feline progressive histiocytosis (FPH) represents a significant gap in understanding feline dermatopathology.
Purpose of the Study:
- To summarize the clinical, morphological, and immunophenotypic characteristics of FPH in a cohort of 30 cats.
- To investigate the cellular origin and disease progression of FPH.
- To evaluate treatment outcomes for FPH.
Main Methods:
- Retrospective case series analysis of 30 cats diagnosed with FPH.
- Clinical data collection including signalment, lesion description, and disease course.
- Morphological assessment of histopathological findings and immunophenotyping of lesional cells using markers such as CD1a, CD1c, CD18, MHC class II, and E-cadherin.
Main Results:
- No specific breed or age predilection was observed; females were more frequently affected.
- Lesions presented as papules, nodules, or plaques on the extremities and face, with both epitheliotropic and nonepitheliotropic patterns.
- Immunophenotyping suggested a dendritic cell (DC) origin, with variable expression of E-cadherin.
- FPH followed a progressive course, predominantly cutaneous but with systemic involvement in 7 cases.
- Treatments with chemotherapy, immunosuppressants, or immunomodulators were largely unsuccessful.
Conclusions:
- FPH is characterized by progressive histiocytic infiltrates of presumed DC origin.
- The disease follows an initially indolent, slowly progressive course, with potential for late-stage systemic dissemination.
- Current therapeutic options show limited efficacy, highlighting the need for further research into FPH etiology and treatment.
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