CEACAM5 and intrahepatic cholangiocarcinoma: In patients with cHCC-ICC, carcinoembryonic antigen (CEA) was reported to be elevated in 17–29% of cases, similar to the patients with ICC (Garancini et al. 2014; Lee et al. 2006; Yin et al. 2012; Zhao et al. 2016; Zhang et al. 2024).