Classification of Canine Malignant Lymphomas According to the World Health Organization Criteria

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  • V. E. Valli
    VDx Veterinary Diagnostics, Davis, CA, USA
  • M. San Myint
    Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, USA
  • A. Barthel
    Antech Diagnostics, Moab, UT, USA
  • D. Bienzle
    Department of Pathobiology, College of Veterinary Medicine, University of Guelph, Guelph, Ontario, Canada
  • J. Caswell
    Department of Pathobiology, College of Veterinary Medicine, University of Guelph, Guelph, Ontario, Canada
  • F. Colbatzky
    Department of Non-Clinical Drug Safety, Boehringer-Ingelheim Pharma GmbH &Co. KG, Biberach, Germany
  • A. Durham
    Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA, USA
  • E. J. Ehrhart
    Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
  • Y. Johnson
    Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, USA
  • C. Jones
    IDEXX Laboratories, Auburn, MA, USA
  • M. Kiupel
    Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA
  • P. Labelle
    Antech Diagnostics, Lake Success, NY, USA
  • S. Lester
    Veterinary Pathology Consultants, Lake Stevens, WA, USA
  • M. Miller
    Department of Comparative Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
  • P. Moore
    Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, UC Davis, Davis, CA, USA
  • S. Moroff
    Antech Diagnostics, Lake Success, NY, USA
  • P. Roccabianca
    Animal Pathology, Faculty of Veterinary Medicine, University of Milan, Milan, Italy
  • J. Ramos-Vara
    Department of Comparative Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
  • A. Ross
    Australian Animal Pathology Standards Program, Frankston, Australia
  • T. Scase
    Bridge Pathology Ltd., Bristol, UK
  • H. Tvedten
    Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
  • W. Vernau
    Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, UC Davis, Davis, CA, USA

Description

<jats:p> A study was carried out to test the accuracy and consistency of veterinary pathologists, not specialists in hematopathology, in applying the World Health Organization (WHO) system of classification of canine lymphomas. This study represents an initiative of the ACVP Oncology Committee, and the classification has been endorsed by the World Small Animal Veterinary Association (WASVA). Tissue biopsies from cases of canine lymphoma were received from veterinary oncologists, and a study by pathologists given only signalment was carried out on 300 cases. Twenty pathologists reviewed these 300 cases with each required to choose a diagnosis from a list of 43 B and T cell lymphomas. Three of the 20 were hematopathologists who determined the consensus diagnosis for each case. The 17 who formed the test group were experienced but not specialists in hematopathology, and most were diplomates of the American or European Colleges of Veterinary Pathology. The overall accuracy of the 17 pathologists on the 300 cases was 83%. When the analysis was limited to the 6 most common diagnoses, containing 80% of all cases, accuracy rose to 87%. In a test of reproducibility enabled by reintroducing 5% of cases entered under a different identity, the overall agreement between the first and second diagnosis ranged from 40 to 87%. The statistical review included 43,000 data points for each of the 20 pathologists. </jats:p>

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