Periocular fibrosarcoma with lipogranulomatous conjunctivitis in a cat.

A 9-year-old, female spayed domestic short-haired cat was presented with a 4-year history of bilateral lipogranulomatous conjunctivitis (LGC), which was confirmed via histopathology. Thirteen months following the initial biopsy, the cat was presented with a rapidly progressive mass lesion of the palpebral conjunctiva of the right eye. A surgical debulking, followed 1 month later by exenteration after marked regrowth of the mass confirmed fibrosarcoma.

Computed tomographic features of exocrine pancreatic carcinomas in dogs and cats.

Exocrine pancreatic carcinomas are uncommon in dogs and cats, and diagnosis with diagnostic imaging can be challenging. This retrospective, multi-institutional, descriptive study was performed to evaluate the CT features of exocrine pancreatic carcinomas. The CT examinations of 18 dogs and 12 cats with exocrine pancreatic carcinomas diagnosed by cytology or histopathology were reviewed.

Vincristine-induced adverse events related to body weight in dogs treated for lymphoma.

Background: Traditional dosing of chemotherapy drugs based on body surface area may overdose small dogs, leading to an increased frequency of adverse events (AEs).

Hypothesis/objectives: Evaluate the frequency of hematologic and gastrointestinal AEs in dogs with newly diagnosed lymphoma treated with vincristine weighing ≤15 kg in comparison to dogs weighing >15 kg. We hypothesized that dogs weighing ≤15 kg would experience a higher frequency of AEs.

Evaluation of the clinical outcome of hypercalcemia of malignancy and concurrent azotemia in dogs with lymphoma.

Background: Hypercalcemia of malignancy (HM) secondary to lymphoma in dogs has the potential to cause renal injury.

Hypothesis/objectives: Characterize outcomes related to acute kidney injury (AKI) secondary to HM. We hypothesized that dogs do suffer AKI regardless of HM severity at the time of lymphoma diagnosis or relapse.

Clinical outcomes in cats with renal carcinoma undergoing nephrectomy: A retrospective study.

Renal carcinomas (RC) are uncommonly encountered in feline medicine. Limited information regarding clinical presentation and postoperative outcomes is available. The purpose of this multi-institutional, retrospective study was to describe the presenting features and clinical outcomes of cats with RC undergoing nephrectomy.

Imaging features of benign synovial inflammation affecting the long digital extensor tendon sheath in a dog.

A dog was evaluated for right pelvic limb lameness. Computed tomography and magnetic resonance imaging revealed an irregular, contrast-enhancing mass extending along the proximolateral right tibia, involving the long digital extensor tendon (LDET) ± cranial tibialis muscle. Pulmonary nodules, nonspecific hepatomegaly, and splenic nodules were also present.

Clinical Utility of Cytology from Preoperative Percutaneous Fine Needle Aspirates of Solitary Liver Masses in 220 Dogs: A Retrospective Study (2009-2019).

When a solitary liver mass is identified in a dog, a fine-needle aspirate (FNA) is commonly employed to attempt to obtain a diagnosis. Little information is provided in the literature evaluating the sensitivity/specificity of FNA cytology for solitary liver masses. We hypothesized that liver lesion size nor the presence of cavitation would impact the success of cytological diagnosis.

Use of doxorubicin chemotherapy following debulking surgery in the treatment of a cat with mesenteric hemangiosarcoma.

Case Summary: A 7-year-old male castrated domestic shorthair cat presented with a 5-day history of inappetence. A mid-abdominal mass was palpated and, on exploratory laparotomy, a cystic mass arising from the root of the mesentery was observed. The mass was drained, debulked and omentalized.

Retrospective study of 20 cats surgically treated for insulinoma.

Objective: To report the clinical signs, histopathology results, and prognostic factors for outcomes following excision for feline insulinoma (INS).

Study Design: Retrospective study.

Sample Population: Twenty client-owned cats.

Evaluation of coated platelets, a subset of highly procoagulant platelets, in healthy dogs and dogs with neoplasia.

Objective: To determine if dogs with neoplasia produce more coated platelets, a subpopulation of activated platelets generated by dual stimulation with thrombin and convulxin, a glycoprotein VI agonist, than healthy control dogs.

Animals: Client-owned dogs diagnosed with lymphoma (n = 19) or solid tumors (14) and healthy control dogs (14).

Procedures: Platelets were stimulated ex vivo with thrombin and convulxin.

Toceranib phosphate in the management of canine insulinoma: A retrospective multicentre study of 30 cases (2009-2019).

Background: Insulinomas are the most common tumour of the endocrine pancreas in dogs. These malignant tumours have a high metastatic rate and limited chemotherapeutic options. The multi-receptor tyrosine kinase inhibitor sunitinib malate has benefit in the treatment of metastatic insulinoma in people.

Outcome in dogs with curative-intent treatment of localized primary pulmonary histiocytic sarcoma.

Primary pulmonary histiocytic sarcoma (PHS) is a rare form of dendritic cell or macrophage neoplasia originating within the pulmonary parenchyma. There is limited literature describing prognosis in dogs with PHS receiving curative-intent treatment consisting of surgical excision and adjuvant chemotherapy. The primary objective of this study was to report outcomes in dogs with localized PHS treated with standardized local and systemic therapy.

Characterization of receptor tyrosine kinase activation and biological activity of toceranib phosphate in canine urothelial carcinoma cell lines.

Background: Urothelial carcinoma (UC) accounts for > 90% of canine tumors occurring in the urinary bladder. Toceranib phosphate (TOC) is a multi-target receptor tyrosine kinase (RTK) inhibitor that exhibits activity against members of the split kinase family of RTKs. The purpose of this study was to evaluate primary UC tumors and UC cell lines for the expression and activation of VEGFR2, PDGFRα, PDGFRβ, and KIT to assess whether dysregulation of these RTKs may contribute to the observed biological activity of TOC.

Feline cutaneous lymphoma: an evaluation of disease presentation and factors affecting response to treatment.

Objectives: The primary goal of this study was to characterize the clinical presentation of feline cutaneous lymphoma. The secondary aims included determining if treatment or initial response to treatment affected the overall survival of patients, and understanding if disease characteristics such as immunophenotype, cell size or the presence of epitheliotropism influenced response to treatment.

Methods: Veterinary medical oncologists at four academic veterinary teaching hospitals submitted cases of feline patients with cutaneous lymphoma diagnosed by histopathology or cytology.

A retrospective analysis of 11 dogs with surface osteosarcoma.

While the majority of canine osteosarcomas (OSA) arise from the medullary cavity, a subset arises from the surface of bone. In humans, surface OSA often has a more indolent disease course with better outcomes than medullary OSA. The aim of this retrospective case series was to evaluate the clinical outcome and potential prognostic factors of dogs with surface OSA.

Outcomes of cats treated with maxillectomy: 60 cases. A Veterinary Society of Surgical Oncology retrospective study.

Maxillectomy is poorly described for the management of oral tumours in cats and is occasionally not recommended because of the high complication rate and sub-optimal outcome reported in cats treated with mandibulectomy. The purpose of this study was to retrospectively evaluate the complications and oncologic outcome in cats treated with maxillectomy. Sixty cats were included in the study.

Determination of a serum total calcium concentration threshold for accurate prediction of ionized hypercalcemia in dogs with and without hyperphosphatemia.

Background: Total serum calcium (tCa) concentrations are poorly predictive of ionized calcium (iCa) status in dogs.

Hypothesis: There is an optimal threshold of tCa concentration that is highly predictive of ionized hypercalcemia and this threshold is higher in hyperphosphatemic dogs as compared to nonhyperphosphatemic dogs.

Animals: Nonhyperphosphatemic (n = 1593) and hyperphosphatemic (n = 250) adult dogs.

Perioperative complications and outcome after surgery for treatment of gastric carcinoma in dogs: A Veterinary Society of Surgical Oncology retrospective study of 40 cases (2004-2018).

Objective: To describe the clinical characteristics, perioperative complications, and outcomes in dogs surgically treated for gastric carcinoma.

Study Design: Multi-institutional retrospective case series.

Animals: Forty client-owned dogs with histologically confirmed gastric carcinoma.

Primary pulmonary histiocytic sarcoma in dogs: A retrospective analysis of 37 cases (2000-2015).

Primary pulmonary histiocytic sarcoma (PHS) has been reported, but is not well characterized. The aim of this retrospective study was to describe clinical characteristics, characterize prognostic factors and report the outcome of a larger group of dogs with primary PHS. Medical records of dogs diagnosed with primary PHS at 11 institutions were retrospectively reviewed.

Thymidine Kinase Type 1 and C-Reactive Protein Concentrations in Dogs with Spontaneously Occurring Cancer.

Background: Serum thymidine kinase type 1 (TK1) and canine C-Reactive Protein (cCRP) might be useful in detecting dogs with cancer. Algorithms combining biomarkers are sometimes more accurate than results of individual tests.

Objectives: The aim of this study was to compare serum TK1 and cCRP and Neoplasia Index (NI) in healthy and tumor-bearing dogs.

Evaluation of a combination chemotherapy protocol including lomustine and doxorubicin in canine histiocytic sarcoma.

Objectives: To describe a chemotherapy protocol combining lomustine and doxorubicin in canine histiocytic sarcoma, including outcomes and toxicity.

Materials And Methods: Retrospective review of case records for dogs with histiocytic sarcoma treated with lomustine and doxorubicin (± cyclophosphamide) alternating every 2 weeks. Data collected included signalment, clinical signs, clinicopathological abnormalities, extent of disease, response, toxicity, time to tumour progression and survival time.

Applicability of 3T body MRI in assessment of nonfocal bone marrow involvement of hematopoietic neoplasia in dogs.

Background: The utility of whole body magnetic resonance imaging (MRI) in detecting bone marrow infiltration in dogs with cancer has not been investigated.

Objectives: To assess the feasibility of 3T body MRI for bone marrow assessment in dogs with hematopoietic neoplasia.

Animals: Seven dogs with B-cell lymphoma, 3 dogs with myelodysplastic syndrome (MDS), and 2 clinically normal dogs.

Parenchymal signal intensity in 3-T body MRI of dogs with hematopoietic neoplasia.

We performed a preliminary study involving 10 dogs to assess the applicability of body MRI for staging of canine diffuse hematopoietic neoplasia. T1-weighted (before and after intravenous gadolinium), T2-weighted, in-phase, out-of-phase, and short tau inversion recovery pulse sequences were used. By using digital region of interest (ROI) and visual comparison techniques, relative parenchymal organ (medial iliac lymph nodes, liver, spleen, kidney cortex, and kidney medulla) signal intensity was quantified as less than, equal to, or greater than that of skeletal muscle in 2 clinically normal young adult dogs and 10 dogs affected with either B-cell lymphoma (n = 7) or myelodysplastic syndrome (n = 3).

Molecular profiling reveals prognostically significant subtypes of canine lymphoma.

We performed genomewide gene expression analysis of 35 samples representing 6 common histologic subtypes of canine lymphoma and bioinformatics analyses to define their molecular characteristics. Three major groups were defined on the basis of gene expression profiles: (1) low-grade T-cell lymphoma, composed entirely by T-zone lymphoma; (2) high-grade T-cell lymphoma, consisting of lymphoblastic T-cell lymphoma and peripheral T-cell lymphoma not otherwise specified; and (3) B-cell lymphoma, consisting of marginal B-cell lymphoma, diffuse large B-cell lymphoma, and Burkitt lymphoma. Interspecies comparative analyses of gene expression profiles also showed that marginal B-cell lymphoma and diffuse large B-cell lymphoma in dogs and humans might represent a continuum of disease with similar drivers.