To determine the role of AXL in bile duct cancer patients, we first evaluated mRNA expression of AXL in patient tissues with normal liver and cholangiocarcinoma using UALCAN, a web-based platform for differential gene expression based on publicly available omics data (TCGA, MET500, CPTAC and CBTTC) [26,27]. Here, AXL is linked to cholangiocarcinoma.