NCI Drug Dictionary
The search textbox has an autosuggest feature. When you enter three or more characters, a list of up to 10 suggestions will popup under the textbox. Use the arrow keys to move through the suggestions. To select a suggestion, hit the enter key. Using the escape key closes the listbox and puts you back at the textbox. The radio buttons allow you to toggle between having all search items start with or contain the text you entered in the search box.
A human serotype 5, replication-defective, first generation adenoviral vector, with the viral E1a and E3 protein encoding regions deleted, which is engineered to express the herpes simplex virus thymidine kinase (HSV-tk) gene under the transcriptional control of the CMV promoter. This agent, when administered in conjunction with a synthetic acyclic guanosine analogue, possesses potential antineoplastic activity. Upon administration into the peritumoral region after tumor resection, adenoviral vector encoding HSV thymidine kinase is transduced into tumor cells, and HSV-tk is expressed. Tumor cells expressing HSV-tk are sensitive to synthetic acyclic guanosine analogues. Subsequent administration of a synthetic acyclic guanosine analogue, such as valacyclovir (VCV) or ganciclovir (GCV), kills the tumor cells expressing HSV-tk. The release of tumor-associated antigens (TAA) by dying tumor cells may then stimulate an antitumor cytotoxic T lymphocyte (CTL) response, directed aganst any remaining tumor cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)