ALAS1 and intrahepatic cholangiocarcinoma: It should be noted that of the 50 genes shared by the 52-week gene expression data (TCDD, PCB126, and PCB153) and gene expression data from the published reports of ICC and HCA, only 4 genes (Got2, Ugcg, Stmn1 and Alas1) were found to be differentially expressed by the non-DLC PCB153.