Researchers have completed the largest genetic analysis of feline cancer to date, examining tumor samples from approximately 500 domestic cats across five countries. The study, published in Science, represents a significant advance in understanding cancer at the molecular level in cats, an area that had previously received limited scientific investigation despite cancer being a leading cause of illness and death in the species.
The research team identified numerous genetic driver genes—mutations that facilitate uncontrolled cell growth and tumor development—in cat cancers. Notably, many of these driver genes were previously recognized in human and canine cancers. In aggressive mammary tumors, researchers found that the FBXW7 gene was mutated in more than half of examined cases. This gene normally regulates proteins controlling cell growth and division, and its dysfunction in both cats and humans is associated with worse prognosis, suggesting parallel disease mechanisms across species.
The findings extend beyond breast tissue to include cancers affecting blood, bones, lungs, skin, gastrointestinal tissue, and the central nervous system. The genetic similarities between feline and human cancers may be particularly valuable for research purposes, as domestic cats inhabit the same environments as their human owners and encounter comparable environmental risk factors such as household chemicals, air pollutants, and smoke exposure. This shared environment provides a unique opportunity to study how genetics and environmental factors interact in cancer development.
At the laboratory level, researchers observed that certain chemotherapy drugs demonstrated greater effectiveness against feline mammary tumors with the mutated FBXW7 gene. While these findings were observed only in tissue samples and do not yet demonstrate efficacy in living organisms, they suggest potential applications for precision oncology—an approach that uses tumor-specific genetic information to guide individualized treatment selection.
The study was conducted through collaboration among institutions including the Wellcome Sanger Institute, the University of Guelph’s Ontario Veterinary College, and the University of Bern. Rather than collecting new samples, researchers sequenced DNA from tissues already obtained by veterinarians for diagnostic purposes. The team has created a freely accessible genetic database for future feline cancer research, supporting the broader One Medicine framework, which emphasizes mutual benefits between human and veterinary medicine in advancing treatment options for both species.
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