Protein 53 expression in a mixed Labrador subcutaneous lymphoma

Area of Science:

• Veterinary Pathology
• Canine Oncology
• Immunohistochemistry

Background:

• Lymphoma is a common cancer in dogs, often presenting as enlarged lymph nodes or masses.
• Subcutaneous lymphoma, while less common, can occur and requires accurate diagnosis for appropriate management.
• Immunohistochemistry plays a crucial role in differentiating lymphoma subtypes and assessing prognostic markers.

Observation:

• An 11-year-old mixed female Labrador presented with two subcutaneous masses on the trunk and neck.
• Histopathological examination revealed diffuse infiltration of small lymphoid cells, particularly around blood vessels.
• Immunohistochemical staining showed over 10% CD3-positive lymphoid cells and detected p53 protein expression.

Findings:

• The diagnosis of subcutaneous lymphoma was confirmed through histopathology and immunohistochemistry.
• The presence of p53 expression, a marker of p53 mutation, was noted.
• The dog later developed multicentric lymphoma, indicating disease progression.

Implications:

• This case highlights the importance of immunohistochemistry in diagnosing canine lymphoma and identifying prognostic indicators.
• The detection of p53 expression suggests a potential link between p53 mutation and aggressive lymphoma behavior in dogs.
• Findings underscore the poor prognosis associated with canine tumors exhibiting p53 mutations, emphasizing the need for further research into targeted therapies.