Gene therapy is an experimental technique that uses genes to treat or prevent disease. In the future, this technique may allow doctors to treat a disorder by inserting a gene into a patient's cells instead of using drugs or surgery. Gene therapy is a medical field that focuses on the utilization of the therapeutic delivery of nucleic acids into a patient's cells as a drug to treat disease Gene therapy is designed to introduce genetic material into cells to compensate for abnormal genes or to make a beneficial protein. Alternately, a sample of the patient's cells can be removed and exposed to the vector in a laboratory setting. The cells containing the vector are then returned to the patient.