Vandetanib Gemcitabine Or Placebo Plus Gemcitabine Or Vandetanib Monotherapy In Advanced Biliary Tract Cancer

Inclusion Criteria: * Histologically or cytologically-confirmed advanced (unresectable or metastatic) biliary tract cancer (gallbladder cancer, cancer of the extrahepatic bile duct, intrahepatic cholangiocarcinoma and ampullary carcinoma) * Patients must have measurable or evaluable but non-measurable disease * Chemotherapy-naïve (prior chemotherapy in the adjuvant setting completed more than 3 months before the trial entry is accepted). * WHO performance status 0 to 2: patients must have a WHO PS ≤ 2 Exclusion Criteria: * Patients must not have received prior systemic therapy for advanced (unresectable or metastatic) disease; prior chemotherapy in the adjuvant setting within 3 months before the trial entry is accepted * Inadequate end-organ function or Evidence of severe or uncontrolled systemic disease or any concurrent condition which in the Investigator's opinion makes it undesirable for the patient to participate in the trial or which would jeopardize compliance wit * Significant cardiovascular event (e.g. myocardial infarction, superior vena cava \[SVC\] syndrome, New York Heart Association \[NYHA\] classification of heart disease ³2) within 3 months before entry, or presence of cardiac disease that in the opinion of * History of arrhythmia or QTc with Bazett's correction unmeasurable or ≥ 480 msec on screening ECG