GPT and hilar cholangiocarcinoma: ICCA intrahepatic cholangiocarcinoma; HCCA hilar cholangiocarcinoma; DCCA distal cholangiocarcinoma; GCA gallbladder carcinoma; NLR neutrophil-to-lymphocyte ratio; PLR platelet-to-lymphocyte ratio; MLR monocyte-to-lymphocyte ratio; SII systemic inflammatory index (SII was calculated by multiplying the platelet count by the neutrophil count divided by the lymphocyte count); ALT alanine transaminase; AST aspartate transaminase; CA19-9 glycoprotein antigen 19-9; CONUT score controlling nutritional status score; other types of immune drugs included sintilimab and dovalizumab.