PDQ_Closed_Trial_Search_ID PDQ_Closed_Trial_Search_ID Conceptual Entity P330 PDQ Closed Trial Search ID PDQ_Closed_Trial_Search_ID A property representing the identifier used by NCI's Cancer.gov web site to retrieve PDQ Clinical Trials data for closed trials that involved specific clinical trials agents. While the identifier is the same for both open and closed trials two properties are used to support requirements of the current browser interface, as well as the possibility of providing values where only closed trials will be retrieved.