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Numerous factors are known to affect the prognosis of dogs with chemotherapy-treated lymphomas. However, prognostic factors for dogs with specific subtypes of lymphoma are less clearly defined. The objective of this study was to identify prognostic factors for dogs receiving CHOP-based chemotherapy for primary nodal diffuse large B-cell lymphoma (DLBCL). Medical records of dogs treated for DLBCL at the Purdue Veterinary Teaching Hospital (PUVTH) from 2006 to 2016 were reviewed. Factors potentially related to prognosis were analysed using multivariable statistical methods. Ninety-eight dogs were included in the study. Best overall response to chemotherapy was complete remission in 80 dogs (81.6%) and partial remission in 18 dogs (18.4%). Median progression-free survival (PFS) for the entire population was 252 days (range 19-1068). Factors significantly associated with achieving partial (rather than complete) remission following CHOP included presence of thrombocytopenia at diagnosis (OR 6.88; 95% CI 1.98-23.93; P = .002), baseline serum globulin concentration (OR 2.63; 95% CI 1.03-6.75; P = .044), and age at diagnosis (OR 1.36; 95% CI 1.08-1.71; P = .009). Factors significantly associated with PFS in the lowest quartile (≤93 days) included presence of thrombocytopenia at diagnosis (OR 8.72; 95% CI 1.54-49.33; P = .014), age at diagnosis (OR 1.47; 95% CI 1.12- 1.94; P = .005), and baseline neutrophil count (OR 1.18; 95% CI 1.02-1.37; P = .025). Presence of thrombocytopenia, greater age, higher neutrophil count, and higher serum globulin concentration all may be associated with a particularly poor outcome in dogs receiving CHOP-based chemotherapy for DLBCL. [ABSTRACT FROM AUTHOR]

Papillomas of the conjunctival surface in people can be of viral or nonviral origin and are found in high association with human papillomavirus. Canine conjunctival papillomas are seldom described, and published accounts have mostly been associated with canine oral papillomavirus infection. Here, we describe conjunctival squamous papillomas that do not express papillomavirus proteins and compare them with papillomavirus-associated conjunctival papillomas. Conjunctival squamous papillomas presented a distinct histopathologic profile and lacked the cytopathic effects seen in viral papillomas. They appeared as exophytic, papilliferous, pedunculated lesions with delicate fronds and angular terminal margins. Squamous papillomas presented with a delicate fibrovascular core and were associated both clinically and grossly with a feeder vessel. Pigmentation was variable within the epithelium and stroma of these lesions, and inflammatory infiltrates were characteristically minimal. Conjunctival squamous papillomas resembled squamous papillomas of the skin; however, they lacked significant hyperkeratosis. Compared with conjunctival viral papillomas, these masses occurred in older dogs and were smaller and solitary. Furthermore, polymerase chain reaction and immunohistochemistry failed to demonstrate papillomavirus genetic material and antigens in conjunctival squamous papillomas. Both viral and nonviral conjunctival papillomas were considered benign. [ABSTRACT FROM AUTHOR]

The article tests the application of the World Health Organization (WHO) system for classification of canine malignant lymphomas by veterinary diagnosticians who were experienced but not expert in hematopathology. It describes malignant lymphoma as a disease that affects dogs of all breeds and ages and deemed the most common canine neoplasm treated by chemotherapy. Tissue biopsies were carried out on 300 cases and twenty pathologists were assessed on their diagnostic capabilities based on a list of 43 B and T cell lymphomas using the WHO system.

The article presents a study which examined immunohistochemical detection of meningiomas in cats and dogs which include tumor types as angiomatoid, fibroblastic and microcystic. It states that the immunoreactivity for CD34, claudin-1 and E-cadherin were present in most tumors. Antibody reagents and detection systems used in immunohistochemistry are explained.