NCIt definition : Animal disease whose pathologic mechanisms are sufficiently similar to those of a
human disease for the animal disease to serve as a model.;
Alternative definition : NCI-GLOSS: An animal with a disease either the same as or like a disease in humans.
Animal models are used to study the development and progression of diseases and to
test new treatments before they are given to humans. Animals with transplanted human
cancers or other tissues are called xenograft models.;