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Feline progressive histiocytosis: a retrospective investigation of 26 cases and preliminary study of Ki67 as a prognostic marker.

  • Coste, Margaux1, 2, 3, 4, 5
  • Prata, Daniela1, 2, 3, 4, 5
  • Castiglioni, Vittoria1, 2, 3, 4, 5
  • Minoli, Lucia1, 2, 3, 4, 5
  • Etienne-Raffestin, Claire-Lise1, 2, 3, 4, 5
  • Boulouha, Lilia1, 2, 3, 4, 5
  • Moreau, Stéphanie1, 2, 3, 4, 5
  • Lagadic, Marie1, 2, 3, 4, 5
  • 1 Department of Embryology and Histopathology, Paris-Est University, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, Ile de France, France (Coste). , (France)
  • 2 IDEXX Laboratories, Saint-Denis, Ile de France, France (Prata, Etienne-Raffestin, Boulouha, Moreau, Lagadic). , (France)
  • 3 IDEXX Laboratories Italia, Milan, Italy (Castiglioni). , (Italy)
  • 4 Department of Veterinary Medicine, University of Milan, Milan, Italy (Minoli). , (Italy)
  • 5 Mouse and Animal Pathology Lab, Fondazione Filarete, Milan, Italy (Minoli). , (Italy)
Published Article
Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
Publication Date
Nov 01, 2019
DOI: 10.1177/1040638719884950
PMID: 31650906


Feline progressive histiocytosis (FPH) is an uncommon and infrequently reported cutaneous histiocytic proliferative disorder, whose clinical presentation is solitary or multiple cutaneous nodules and papules, with late-course internal metastasis. We describe herein the clinical, epidemiologic, histologic, and immunohistochemical features of this entity, and document the outcome of FPH based on a retrospective study of 26 cases. Female and male cats were affected equally. Lesions were evident either as solitary (16 of 26 cases) or multiple (10 of 26 cases) nonpruritic and alopecic nodules or plaques, preferentially located on the legs and extremities (73%). Follow-up was complete for 19 cats, and ranged from 41 to 1,449 d. Nine died of FPH with a median overall survival of 96 d (range: 41-238 d). The disease recurred in 14 cats after surgical excision of the nodules, and the median disease-free survival was 175 d (range: 21-1,449 d). Five of the 26 cats were alive at the end of the study, and 4 had no progression of the disease. Histologically, lesions were characterized by poorly circumscribed, unencapsulated histiocytic infiltration of dermis and subcutis. Epitheliotropism was observed in 11 (42%) cats. Atypical histiocytes diffusely and consistently expressed MHC II, CD18, and Iba1. Statistically significant higher E-cadherin expression was observed in epitheliotropic cases compared to non-epitheliotropic cases. A negative correlation between overall survival and proliferation index was evident, thus suggesting Ki67 as a promising prognostic marker.

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