Introduction
Lymphoma is one of the most common cancers in dogs, and Boxers are especially at risk. But why? With funding from CHF Grant 02318: Genetic and Environmental Risk for Lymphoma in Boxer Dogs, investigators at the University of Wisconsin, Madison set out to learn more about the combinations of genetic mutations and toxin exposures that contribute to canine lymphoma.
This research breakthrough reveals that while Boxers don’t appear to have more genetic mutations related to detoxifying enzymes than other breeds, their environment may play a much bigger role in their cancer risk than previously thought.
Key Points
- Boxers living near nuclear power plants or chemical facilities are at significantly higher risk of developing lymphoma.
- No significant difference in detox enzyme activity or DNA damage was found between Boxers and other breeds.
- Environmental exposure, not breed-specific genetics, may be the key driver of lymphoma risk in Boxers.
- Ongoing studies are exploring how genetic mutations and environmental toxins interact in canine cancer.
Challenge Background
Lymphoma affects the lymphoid cells of the immune system and is a leading cancer diagnosis in dogs. Despite identifying over 30 subtypes of canine lymphoma, the root causes—especially why certain breeds like Boxers are more vulnerable—remain unclear. Scientists have long suspected that both inherited genetic mutations and exposure to environmental toxins contribute to cancer risk, but the exact mechanisms are poorly understood. Understanding these factors is essential for developing effective prevention strategies.
The Breakthrough
Researchers at the University of Wisconsin–Madison, supported by CHF Grant 02318, investigated whether Boxers have more genetic mutations in Glutathione-S-transferases (GSTs)—enzymes that help detoxify harmful chemicals. They also measured DNA damage in Boxers with and without lymphoma.
Surprisingly, the study found no significant difference in GST enzyme activity or DNA damage between Boxers and other breeds. However, the environmental data told a different story:
- Boxers living within 10 miles of a nuclear power plant were 5 times more likely to develop lymphoma.
- Those living within 2 miles of a crematorium or chemical manufacturer/supplier also had increased risks
Impact & Next Steps
This research shifts the focus from genetics alone to the environmental risks dogs face, especially in industrial or high-toxin areas. It opens the door to new prevention strategies, such as reducing exposure to harmful chemicals in a dog’s surroundings.
Ongoing CHF-funded studies at North Carolina State University, Michigan State University, and the University of Washington are now exploring how genetic mutations accumulate in different types of lymphoma. These efforts are part of CHF’s One Health initiative, which aims to improve health outcomes for both dogs and humans by understanding shared environmental risks. Results could help prevent cancer in dogs and humans. Learn more about this important research at www.akcchf.org/lymphomaRPA.
References:
Craun, K., Ekena, J., Sacco, J., Jiang, T., Motsinger‐Reif, A., & Trepanier, L. A. (2020). Genetic and environmental risk for lymphoma in boxer dogs. Journal of Veterinary Internal Medicine. https://doi.org/10.1111/jvim.15849
