MKI67 and intrahepatic cholangiocarcinoma: Considering this, we aimed to (1) study the influence of the archival time of the FNA smears and CBs of CL on the Ki67 antigenicity; (2) evaluate and compare the Ki67 index obtained by ICC in PSCS and matched CBs; (3) assess the association between Ki67 index classification in PSCS and CBs and survival time and evaluate survival differences within the high Ki67 index group in relation to treatment.