Further analysis using the sGEO dataset (GSE32225) and cBioPortal also demonstrated elevated AXL expression in bile duct tumor tissues and suggested high AXL mRNA expression as a potential indicator of poor survival compared to those patients with low AXL expression, supporting the concept that dysregulated expression of AXL mRNA or activity is a prognostic marker for bile duct cancer (Supplementary Figure S1a,b). This evidence concerns the gene AXL and bile duct neoplasm.