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Kaur J, Diamantino G, Morrison K, Meichner K, Springer NL, Hoffman M, Bienzle D, Stokol T. Acute myeloid leukemia with peripheral lymph node involvement in dogs: A retrospective study of 23 cases. Vet Pathol 2025; 62:195-205. [PMID: 39540621 DOI: 10.1177/03009858241295397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2024]
Abstract
Acute myeloid leukemia (AML) can infiltrate extramedullary tissues, such as the liver, spleen, and lymph nodes and can be difficult to differentiate from lymphoma in cytologic and histologic specimens. Our goal was to identify cytologic features that would support a diagnosis of AML in peripheral lymph node aspirates, for which we used the term extramedullary AML (eAML). Medical records of 23 dogs with a diagnosis of AML and archived lymph node aspirate smears from 2016 to 2024 were reviewed across 4 institutions. Inclusion criteria included ≥50% myeloid blasts plus differentiating myeloid cells in lymph node smears, confirmation of myeloid lineage by flow cytometric analysis, and complete medical records. Peripheral lymphadenopathy was the reason for presentation (9/23, 39%) or was found incidentally on physical examination (14/23, 61%). Most dogs were bi- or pancytopenic (18/23, 78%), with blasts identified in blood smears of 18 dogs (78%). Initial lymph node aspirate interpretations included hematopoietic neoplasia (8/21, 38%), AML (6/21, 29%), lymphoma (5/21, 24%), lymphoid hyperplasia (1/21, 5%), and granulocytic precursor infiltrates (1/21, 5%). On lymph node smear review, cytologic features supporting an eAML were differentiating granulocytes, blasts with myeloid features or promonocytes, dysplastic changes in myeloid cells, and retention of residual lymphocytes. The median survival was 22 days (range = 1-360 days), and 69% of 16 dogs given chemotherapy or glucocorticoids lived for 30 days or more. Our study highlights the importance of hemogram results and lymph node aspirate smear examination for morphologic features of myeloid differentiation to help diagnose eAML in lymph node smears.
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Meredith AM, Beeler-Marfisi J, Berke O, Mutsaers AJ, Bienzle D. Standardized bone marrow assessment, risk variables, and survival in dogs with myelodysplastic syndrome and acute myeloid leukemia. Vet Pathol 2025; 62:64-73. [PMID: 39291964 PMCID: PMC11697499 DOI: 10.1177/03009858241277982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
Myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML) are heterogeneous neoplasms of hematopoietic stem cells that are challenging to diagnose, differentiate, and prognosticate. Cytogenetic and mutational analyses are useful in humans but unavailable for dogs, where diagnosis and classification still rely largely on hematologic and morphologic assessment. The objectives of this study were to apply a classification scheme to myeloid neoplasms and to assess outcome in relation to predictor variables. Keyword search of a laboratory database, application of sequential exclusion criteria, and consensus from 3 reviewers yielded 70 cases of myeloid neoplasia with hematology results, and cytologic (11), histologic (14), or both (45) types of marrow specimens. Based on blast percentage and morphology, 42 cases were classified as MDS and 28 as AML. Dogs with MDS had significantly lower body weights, hemoglobin concentrations and blood blasts, and higher red blood cell size variability and platelet numbers than dogs with AML. Estimates of median survival using Kaplan-Meier curves for dogs with MDS and AML were 384 and 6 days, respectively (P < .001). The instantaneous risk of death for dogs with MDS was approximately 5× lower than that of dogs with AML. Significant predictor variables of survival were body weight, white blood cell count, platelet count, and percent blood blasts (P < .05). Hazard ratios (HRs) derived from best-fitting Cox regression models were 1.043, 0.998, and 1.061 for increased neutrophils, decreased platelets, and increased blood blasts, respectively. Findings from this study suggest that hematologic and morphologic variables are useful to predict outcomes in myeloid neoplasia.
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Affiliation(s)
| | | | - Olaf Berke
- University of Guelph, Guelph, ON, Canada
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Rogato F, Szladovits B, Martineau H, Yale AD, Mitchell JL, Holmes EJ, Gardner RH, Guillén A. Leukemia cutis as a prominent clinical sign in a dog with acute myeloid leukemia. Vet Clin Pathol 2024; 53:448-457. [PMID: 39289176 PMCID: PMC11735650 DOI: 10.1111/vcp.13382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 06/26/2024] [Accepted: 07/13/2024] [Indexed: 09/19/2024]
Abstract
An eight-year-old male neutered crossbreed dog presented with erosive and ulcerative cutaneous lesions in the inguinal regions, the medial aspect of both thighs, and the stifles. Hematologic assessment revealed nonregenerative anemia, thrombocytopenia, and high numbers of neoplastic mononuclear cells with a variable degree of maturation. The mononuclear neoplastic cells, with nuclei measuring 10-20 microns in diameter, accounted for 57% of the nucleated blood cells. In addition, the blood contained increased numbers of mature neutrophils and monocytes with atypical morphology. Cytologic examination of the right popliteal lymph node found high numbers of large mononuclear cells with similar morphology to those in the peripheral blood. Flow cytometry of peripheral blood revealed expression by the mononuclear neoplastic cells of the pan-leukocyte marker CD45 and myeloid markers CD14, MAC387, and myeloperoxidase (MPO). These results confirmed a diagnosis of acute myeloid leukemia (AML). Computed tomography found moderate nodular hepatosplenomegaly and multifocal bi-cavitary lymphadenopathy. Histopathologic examination of biopsies from the cutaneous lesions identified infiltration of the dermis by intermediate to large neoplastic round cells. Further treatment was declined, and the owners elected euthanasia. Postmortem examination confirmed AML involvement in the bone marrow, peripheral and intracavitary lymph nodes, heart, liver, kidney, and skin. Neoplastic cells in the bone marrow and skin showed positive immunolabeling for ionized calcium-binding adaptor protein 1 and MPO. To the best of our knowledge, this is the first report of ulcerative cutaneous lesions observed among the presenting clinical signs in a dog with AML and secondary leukemia cutis.
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Affiliation(s)
- Francesco Rogato
- Department of Clinical Sciences and ServicesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Balazs Szladovits
- Department of Pathobiology and Population SciencesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Henny Martineau
- Department of Pathobiology and Population SciencesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Andrew D. Yale
- Department of Clinical Sciences and ServicesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Jordan L. Mitchell
- Department of Pathobiology and Population SciencesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Emma J. Holmes
- Department of Pathobiology and Population SciencesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Rachel H. Gardner
- Department of Pathobiology and Population SciencesRoyal Veterinary CollegeHatfieldHertfordshireUK
| | - Alexandra Guillén
- Department of Clinical Sciences and ServicesRoyal Veterinary CollegeHatfieldHertfordshireUK
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Harris RA, Nolan J, Ammons D, Beeson S, Thamm D, Avery A. Advancements in genetic analysis: Insights from a case study and review of next-generation sequencing techniques for veterinary oncology applications. Vet Clin Pathol 2024. [PMID: 39367609 DOI: 10.1111/vcp.13388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 08/03/2024] [Accepted: 08/22/2024] [Indexed: 10/06/2024]
Abstract
Acute myeloid leukemia (AML) poses significant challenges in veterinary medicine, with limited treatment options and poor survival rates. While substantial progress has been made in characterizing human AML, translating these advancements to veterinary practice has been hindered by limited molecular understanding and diagnostic tools. The case study presented illustrates the application of whole genome sequencing in diagnosing AML in a dog, showcasing its potential in veterinary oncology. Our approach facilitated comprehensive genomic analysis, identifying mutations in genes that may be associated with AML pathogenesis in dogs, such as KRAS, IKZF1, and RUNX1. However, without supportive evidence of its clinical utility (eg, association with response to treatment or prognosis), the information is limited to exploration. This article reviews the comparative features of canine AML with human AML and discusses strategies to shrink the knowledge gap between human and veterinary medicine with cost-effective next-generation sequencing (NGS) techniques. By utilizing these approaches, the unique and shared molecular features with human AML can be identified, aiding in molecular classification and therapeutic development for both species. Despite the promise of NGS, challenges exist in implementing it into routine veterinary diagnostics. Cost considerations, turnaround times, and the need for robust bioinformatics pipelines and quality control measures must be addressed. Most importantly, analytical and clinical validation processes are essential to ensure the reliability and clinical utility of NGS-based assays. Overall, integrating NGS technologies into veterinary oncology holds great potential for advancing our understanding of AML and improving disease stratification, in hopes of improving clinical outcomes.
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Affiliation(s)
- R Adam Harris
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, USA
| | - Jillian Nolan
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, USA
| | - Dylan Ammons
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, USA
| | - Samantha Beeson
- Department of Clinical Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Douglas Thamm
- Department of Clinical Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Anne Avery
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, USA
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Stokol T, Thomas SI, Hoffman M, Zhao S. Flow cytometric-based detection of CD80 is a useful diagnostic marker of acute myeloid leukemia in dogs. Front Vet Sci 2024; 11:1405297. [PMID: 39224452 PMCID: PMC11366633 DOI: 10.3389/fvets.2024.1405297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 07/03/2024] [Indexed: 09/04/2024] Open
Abstract
Introduction CD80, a co-stimulatory molecule required for optimal T cell activation, is expressed on antigen-presenting cells, including monocytes and dendritic cells, in dogs and humans. We hypothesized that CD80 would be expressed on tumor cells in dogs from acute myeloid leukemia (AML) but not dogs with lymphoid neoplasms. Methods and results We first evaluated the cellular staining pattern of a hamster anti-murine CD80 antibody (clone 16-10A1, ThermoFisher Scientific Cat# 17-0801-82, RRID: AB_469417) in blood and bone marrow aspirates from healthy dogs. Using flow cytometric analysis and examination of modified Wright's-stained cytologic smears of unsorted and flow cytometric or immunomagnetic bead-sorted leukocytes, we show that the antibody binds to mature and immature neutrophils and monocytes, but not lymphocytes or eosinophils, in blood and bone marrow. We then added the antibody to routine flow cytometric panels for immunophenotyping hematopoietic neoplasms in dogs. We found that the antibody labeled tumor cells in 72% of 39 dogs with AML and 36% of 11 dogs with acute leukemia expressing lymphoid and myeloid markers ("mixed lineage") but none of the dogs with B (n = 37) or T (n = 35) lymphoid neoplasms. A higher proportion of tumor cells in dogs with AML were labeled with the anti-CD80 antibody vs antibodies against other myeloid-associated antigens, including CD4 (36%, p = 0.003), CD11b (44%), CD11c (46%), CD14 (38%, p = 0.006) and CD18 (59%, clone YFC118). In contrast, antibodies against CD11b and CD11c bound to tumor cells in 8-32% of the lymphoid neoplasms. Discussion We show that CD80, as detected by antibody clone 16-10A1, is a sensitive and specific marker for AML and would be useful to include in flow cytometric immunophenotyping panels in dogs.
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Affiliation(s)
- Tracy Stokol
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
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Lyseight FLS, Pittaway C, Dennis R, Cherubini GB. Neurological manifestations in dogs with acute leukemia. Front Vet Sci 2024; 11:1385093. [PMID: 39091386 PMCID: PMC11291356 DOI: 10.3389/fvets.2024.1385093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Accepted: 06/12/2024] [Indexed: 08/04/2024] Open
Abstract
Canine acute leukemia is a rare hematopoietic neoplasm. Neurological abnormalities have been frequently reported in dogs with acute leukemia (AL). However, the description of the presentation and findings are limited. This study aimed to describe the clinical findings in dogs with acute leukemia presenting with neurological signs as their primary complaint. The database of a private referral hospital was searched for cases that presented to the neurological department with neurological deficits and were subsequently diagnosed with acute leukemia. Six cases were included; all had neurological clinical signs and an abnormal neurological examination. All cases had a focal neuroanatomical localisation on neurological examination (brain n = 4; spinal = 2). Out of the four dogs with a complete magnetic resonance imaging (MRI) study, there was an ill-defined infiltrative pattern with abnormal signal intensity in the central nervous system (CNS) in three dogs and the loss of grey and white matter differentiation in the brain (n = 2) and/or spinal cord (n = 2). Other MRI findings included abnormal meningeal enhancement (n = 3), changes affecting spinal nerves and epaxial muscles (n = 2), and lymphadenopathy in the field of view (n = 2). The bone marrow assessment on MRI showed evidence of signal change (n = 3), characterized by a loss of normal fat opacity and an abnormal degree of contrast enhancement. The cerebrospinal fluid (CSF) analysis of the four dogs showed an increased protein level with non-specific pleocytosis and without evidence of malignant cells. Treatment with cytotoxic medication was implemented in two dogs. The dogs diagnosed with acute leukemia had focal neuroanatomical localisation, an infiltrative CNS pattern, and bone marrow remodulation on MRI with an increase in CSF protein and negative cytology analysis.
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Affiliation(s)
- Filipa L. S. Lyseight
- Oncology Service, Dick White Referrals, Part of Linnaeus Veterinary Limited, Cambridgeshire, United Kingdom
| | - Charles Pittaway
- Oncology Service, Dick White Referrals, Part of Linnaeus Veterinary Limited, Cambridgeshire, United Kingdom
| | - Ruth Dennis
- Diagnostic Imaging Service, Dick White Referrals, Part of Linnaeus Veterinary Limited, Cambridgeshire, United Kingdom
| | - Giunio B. Cherubini
- Neurology and Neurosurgery Service, Dick White Referrals, Part of Linnaeus Veterinary Limited, Cambridgeshire, United Kingdom
- Department of Veterinary Sciences, University of Pisa, Pisa, Italy
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Colburn ME, Delaney MA, Anchor GC, Terio KA. Effect of formalin-fixation and paraffin-embedded tissue storage times on RNAscope in situ hybridization signal amplification. J Vet Diagn Invest 2024; 36:498-505. [PMID: 38650110 PMCID: PMC11185121 DOI: 10.1177/10406387241245777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024] Open
Abstract
RNAscope in situ hybridization (ISH) detects target RNA in formalin-fixed, paraffin-embedded (FFPE) tissues. Protocols suggest that prolonged FFPE storage and formalin fixation may impact signal detection, potentially limiting the utility of RNAscope ISH in retrospective studies. To develop parameters for RNAscope use with archived specimens, we evaluated the effect of formalin-fixation time by measuring the signal of a reference gene (16srRNA) in selected tissues fixed in 10% neutral-buffered formalin for 1, 2, 3, 5, 7, 10, 14, 21, 28, 60, 90, 180, and 270 d. The signal intensity and percent area of signal decreased after 180 d. Tissues had detectable signal at 180 d but not at 270 d of formalin fixation. To assess target detection in paraffin blocks, we qualitatively compared the signal of canine distemper virus (CDV) antigen via immunohistochemistry and CDV RNA via RNAscope ISH in replicate sections from blocks stored at room temperature for 6 mo, 1, 3, 6, 8, 11, 13, and 15 y; RNA was detected in FFPE tissues stored for up to 15 y. Our results demonstrate that RNAscope ISH can detect targets in tissues with prolonged paraffin storage intervals and formalin-fixation times.
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Affiliation(s)
- Megan E. Colburn
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, IL, USA
| | - Martha A. Delaney
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, IL, USA
| | - Gretchen C. Anchor
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, IL, USA
| | - Karen A. Terio
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, IL, USA
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London CA, Gardner H, Zhao S, Knapp DW, Utturkar SM, Duval DL, Chambers MR, Ostrander E, Trent JM, Kuffel G. Leading the pack: Best practices in comparative canine cancer genomics to inform human oncology. Vet Comp Oncol 2023; 21:565-577. [PMID: 37778398 PMCID: PMC12065084 DOI: 10.1111/vco.12935] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 08/17/2023] [Accepted: 08/18/2023] [Indexed: 10/03/2023]
Abstract
Pet dogs develop spontaneous cancers at a rate estimated to be five times higher than that of humans, providing a unique opportunity to study disease biology and evaluate novel therapeutic strategies in a model system that possesses an intact immune system and mirrors key aspects of human cancer biology. Despite decades of interest, effective utilization of pet dog cancers has been hindered by a limited repertoire of necessary cellular and molecular reagents for both in vitro and in vivo studies, as well as a dearth of information regarding the genomic landscape of these cancers. Recently, many of these critical gaps have been addressed through the generation of a highly annotated canine reference genome, the creation of several tools necessary for multi-omic analysis of canine tumours, and the development of a centralized repository for key genomic and associated clinical information from canine cancer patients, the Integrated Canine Data Commons. Together, these advances have catalysed multidisciplinary efforts designed to integrate the study of pet dog cancers more effectively into the translational continuum, with the ultimate goal of improving human outcomes. The current review summarizes this recent progress and provides a guide to resources and tools available for comparative study of pet dog cancers.
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Affiliation(s)
- Cheryl A. London
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, USA
| | - Heather Gardner
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts, USA
| | - Shaying Zhao
- University of Georgia Cancer Center, University of Georgia, Athens, Georgia, USA
| | - Deborah W. Knapp
- College of Veterinary Medicine, Purdue University, West Lafayette, Indiana, USA
| | - Sagar M. Utturkar
- Purdue Institute for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Dawn L. Duval
- College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA
| | | | - Elaine Ostrander
- Cancer Genetics and Comparative Genomics Branch, National Cancer Institute, Bethesda, Maryland, USA
| | - Jeffrey M. Trent
- Translational Genomics Research Institute, Phoenix, Arizona, USA
| | - Gina Kuffel
- National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
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Evans SJ. Flow Cytometry in Veterinary Practice. Vet Clin North Am Small Anim Pract 2022; 53:89-100. [DOI: 10.1016/j.cvsm.2022.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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