NCAM1 and intrahepatic cholangiocarcinoma: The native “endothelial-like” properties of the CECs were confirmed by ICC and a variety of endothelial markers including sodium-potassium transporting adenosine triphosphatase (ATP1A1), zonula occludens 1 (ZO-1), N-cadherin, N-CAM, and CD16630, 31, 32 (Figure S4).