Cancer spreads in the body through the blood or the lymph system, with lymphomas being one of the most common cancers in dogs. (dog-health-guide.org)
It may be particularly important in allowing the virus to spread in the body even before it is detectable in the blood. (sciencedaily.com)
Patients» tumors may have various genetic changes; there can be different changes in different parts of the same tumor, as well as in different sites where the tumor spreads in the body. (sciencedaily.com)