Animation on how mice are used to study changes in DNA that could also occur in humans and eventually lead to cancer. The genetic similarity of mice to humans accounts for mice being a good experimental model to study cancer. Mouse models that mimic human disease play a vital role in understanding the etiology (cause and origin) of cancer. Results of mouse model studies lend evidence toward the next step in biomedical research that leads to early detection of cancer, new cancer drugs, new combinations of treatments, or new methods such as gene therapy.]