KRAS and intrahepatic cholangiocarcinoma: To elucidate whether mature hepatocytes can be the origin of ICC induced by Kras activation and Pten deletion, we crossed LSL-KrasG12D/+; Ptenflox/flox mice with Alb-CreERT2+ mice in which tamoxifen (TMX)-inducible CreERT2 was knocked into endogenous Alb locus36.