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Essential thrombocythaemia in two dogs.

R P Favier1, M van Leeuwen, E Teske

  • 1Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80154, 3508 TD Utrecht, The Netherlands. R.P.Favier@vet.uu.nl

Tijdschrift Voor Diergeneeskunde
|June 24, 2004
PubMed
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Two dogs with essential thrombocythaemia (ET) showed anemia and thrombocytosis. High-dose hydroxyurea treatment led to pancytopenia and euthanasia, indicating potential myelosuppressive toxicity.

Area of Science:

  • Veterinary Medicine
  • Hematology
  • Canine Oncology

Background:

  • Essential thrombocythaemia (ET) is a rare myeloproliferative neoplasm characterized by elevated platelet counts.
  • Understanding ET in canines is crucial for developing effective treatment strategies.

Observation:

  • Two dogs presented with reduced exercise tolerance and pale mucous membranes, indicative of anemia.
  • Laboratory findings included moderate-to-severe, Coomb's-negative anemia, marked thrombocytosis, basophilia, and abnormal megakaryocytes in bone marrow.
  • Initial treatment with vincristine and hydroxyurea showed insufficient response.

Findings:

  • High-dose hydroxyurea (2000 mg/m2) administration resulted in further clinical deterioration.
  • Both dogs developed pancytopenia, likely due to the myelosuppressive effects of high-dose hydroxyurea.

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  • The dogs were euthanized six weeks after treatment initiation.

    • Implications:

    • This case report highlights the potential severe myelosuppressive toxicity of high-dose hydroxyurea in dogs with ET.
    • Further research is needed to establish optimal and safer treatment protocols for canine ET.
    • Comparative analysis with human ET suggests potential parallels and differences in disease presentation and treatment response.