Expression of Checkpoint Molecules in the Tumor Microenvironment of Intrahepatic Cholangiocarcinoma: Implications for Immune Checkpoint Blockade Therapy oleh Lara Heij, Jan Bednarsch, Xiuxiang Tan, Mika Rosin, Simone Appinger, Konrad Reichel, Dana Pecina, Michail Doukas, Ronald M. van Dam, Juan Garcia Vallejo, Florian Ulmer, Sven Lang, Tom Luedde, Flavio G. Rocha, Shivan Sivakumar, Ulf Peter Neumann