gene therapy
(jeen THAYR-uh-pee)
An experimental treatment that adds a new gene or replaces or repairs a mutated (changed) gene inside the body’s cells to help prevent or treat certain diseases, such as cancer. Gene therapy may also be used to train the body’s immune system to recognize and attack cancer cells or to protect healthy cells from the effects of cancer treatment. It is being studied in the treatment of some types of cancer.