Clinical trials, also called research studies, test new treatments in people with cancer.

Such information is important because doctors are now testing promising new treatments.

That distinction makes it hard to use the animals to test treatments or vaccines.

Clinical trials are research projects to test new medicines and other treatments.

Dr. Small said one reason researchers wanted a way to find the disease early was to test potential treatments.

I'm talking about researchers who buy the use of your body to test new treatments for various disorders.

They could also be given human genetic diseases and used to test new treatments.

Large simple trials have already been used in Europe to test treatments for heart attack patients, with tens of thousands of people participating.

Animal tumor models are used to learn how a cancer may progress and to test new treatments.

And other companies are now testing potential treatments.