The medical subject headings terms used for the search in ClinicalTrials.gov were (“Recruiting or not yet recruiting” as status), (“biliary tract cancer”, “biliary tract neoplasm”, “cholangiocarcinoma”, “gallbladder cancer”, “Ampulla cancer” as condition/disease) and (“PARP”, “olaparib”, “veliparib”, “niraparib”, “rucaparib”, or “talazoparib” as other terms). The gene discussed is PARP1; the disease is biliary tract cancer.