Exploring risk factors linked to canine lymphoma: a case-control study

Area of Science:

• Veterinary Oncology
• Canine Health
• Environmental Epidemiology

Background:

• Environmental factors contribute significantly to malignant tumors, including in domestic animals.
• Non-Hodgkin's lymphoma (NHL) risk factors have been observed globally in both humans and animals.
• Understanding canine lymphoma etiology is crucial for preventative strategies.

Purpose of the Study:

• To investigate potential risk factors for non-Hodgkin's lymphoma (NHL) in dogs.
• To explore the association between lifestyle, diet, and environmental exposures and canine lymphoma in Porto, Portugal.

Main Methods:

• A case-control study involving 113 dog owners (55 cases, 58 controls) in Porto, Portugal.
• A comprehensive survey with 70 questions assessed dog demographics, diet, and owner habits.
• Statistical analysis, including odds ratios (OR), was used to identify significant risk factors.

Main Results:

• Dogs weighing over 10 kg (OR=9.1) and purebred dogs (OR=2.4) had significantly higher odds of lymphoma.
• Consumption of homemade food (OR=2.7) and fruits/vegetables (OR=2.8) were associated with increased risk.
• Lymphoma-affected dogs showed significantly higher exposure to household smoke (mean index 13.7 vs. 8.4).

Conclusions:

• Canine lymphoma risk appears influenced by a combination of genetic predisposition and owner-related environmental factors.
• Modifiable factors such as diet and exposure to environmental toxins (e.g., smoke) may play a role.
• Further large-scale epidemiological studies are recommended to confirm these findings and inform preventative measures.