Equine mediastinal lymphoma - case report

<p></p><p>ABSTRACT A 20-year-old mixed breed mare was referred to the veterinary hospital with history of weight loss, loss of appetite, and swelling of the chest and neck. On physical exam the patient was in tachycardia and tachypnea and laboratory results indicated hyperproteinemia, hyperfibrinogenemia and hypoalbuminemia. On cardiac auscultation, the pulmonary and aortic valves sounds were not audible. Presence of pleural effusion and heart caudal displacement were identified on electrocardiographic and Doppler echocardiography evaluation and a mass at the base of the heart was oberved through ultrasound scanning around the heart. To alleviate the respiratory condition, thoracic drainage was performed. The pleural effusion presented characteristic serosanguineous with cytologic inflammatory. After returning to stall, the animal died. In necropsy, the presence of a mass positioned around the brachiocephalic trunk was identified and histopathology results were compatible with diffuse small and medium cell lymphoma.</p><p></p

Quantification of Treg cells in peripheral blood and lymph nodes of dogs with multicentric lymphoma

<div><p>ABSTRACT Lymphoma is a malignant tumor characterized by cell proliferation of lymphoid origin and corresponds to 90% of all hematopoietic neoplasms of dogs. Regulatory T cells (Tregs) have been the target of many investigations in oncology due to their potential of down-regulating immune responses, as well as ensuring the maintenance of active mechanisms of tumor suppression. The aims of the present study were to compare the percentage of Tregs in peripheral blood between dogs with multicentric lymphoma and healthy animals, together with the percentage of Tregs in peripheral blood and lymph nodes of dogs with multicentric lymphoma. Twenty-six animals were enrolled in the study: 10 healthy dogs comprised the control group (CG) and 16 dogs with multicentric lymphoma comprised the Lymphoma Group (LG). We observed that dogs in the LG showed a significantly higher Tregs expression in peripheral blood compared to the CG. No significant difference was observed between Tregs expression in lymph nodes and peripheral blood of the LG, however. With these results, it is possible to conclude that multicentric lymphoma is a neoplasm with high Tregs expression, which poses this as a condition of interest when investigating treatments that can suppress Regulatory T cells.</p></div