Advanced intrahepatic cholangiocarcinoma successfully treated with combined immunotherapy: focusing on the tumor immune microenvironment - Omoto, Mayu; Sugimoto, Katsutoshi; Kurebayashi, Yutaka; Kakegawa, Tatsuya; Takahashi, Hiroshi; Wada, Takuya; Takeuchi, Hirohito; Nagao, Toshitaka; Nagakawa, Yuichi; Itoi, Takao (Clinical Journal of Gastroenterology, 2025)