On-treatment Surveillance of Tumor Evolution and Response to Systemic Treatment in Bile Duct and Liver Cancer

The BILLIONSTARS study is a prospective, single arm observational study inviting patients diagnosed with hepatocellular carcinoma (HCC) or cholangiocarcinoma (CCC) who are to be recommended locoregional intervention by surgery, ablation or transarterial chemoembolization and/or antitumoral medical treatment. The aim is to investigate how tumor- and individual-related factors affect response to treatment. To this end, circulating tumor DNA, immune cells and various proteins will be analyzed in repeated blood samples taken before, during and after completion of systemic treatment. When applicable, analyses will also be performed on tumor tissue from resected tumors and biopsies, and in some cases also from autopsies