The primary objective is to assess the anti-tumor activity of the combination of durvalumab and tremelimumab with or without capecitabine by the recurrence-free survival rate after 12 months (RFS@12).~Secondary objectives are to assess the efficacy by recurrence-free surviaval (RFS) and overall survival (OS); to assess safety of the combination treatments (AEs, impact on liver function, use of subsequent therapies); to assess quality of life (QoL).~Exploratory objective is to perform correlation analysis between selected molecular parameters and clinical data to identify molecular biomarkers predictive for RFS and OS.~Patients will be stratified according to the tumor site (ICC vs. ECC vs. gallbladder) and resection status (R0 vs. R1).~In this pilot trial phase, a pick the winner design is applied to determine wether treatment with durvalumab and tremelimumab in combination with or without capecitabine is more promising.~In the initial pilot phase, 40 patients with histologically proven and curatively resected biliary tract cancer (intrahepatic, hilar or distal CCA as well gallbladder carcinoma) without metastatic disease, will be enrolled in a 1:1 randomized design (i.e. 20 patients per Arm).~Patients will be recruited from up to 15 sites and patients withdrawn from the trial will not be replaced.
This is an interventional, prospective multicenter, open-label, phase II study in patients after curative surgery for BTC in a classic adjuvant situation, consisting of a two arm feasibility pilot part with a randomized pick-the-winner design and an option to proceed into a randomized phase 2/3 trial in order to compare the winner with the current SOC (capecitabine).