Approved clinical trials involving gene therapy have been taking place for less than 10 years. As more knowledge is gained about genetics and disease, nurses must have a fundamental understanding of what genes do, how gene therapy is administered, and the risks and potential benefits of treatment. New methods for the administration of adenoviral vectors for cancer treatment in the endoscopy lab are currently being developed. By staying abreast of new treatment methods using gene or viral therapy, the gastrointestinal nurse can actively participate in clinical trials. A basic background of genetics and gene therapy in cancer is discussed. Safety issues and nursing implications regarding the administration and recovery of patients following gene therapy in the GI endoscopy lab are also addressed. An actual case study of a patient who participated in a study utilizing an attenuated adenovirus as investigational therapy for pancreatic adenocarcinoma is presented.