In liver tumors, α-fetoprotein (AFP; a marker for hepatocellular carcinoma), Hep Par1 (Hepatocyte paraffin 1, carbamoyl phosphate synthetase I, a marker protein in mitochondria of hepatocytes), β-catenin, and ki-67 proteins were found to be expressed. The gene discussed is CPS1; the disease is hepatocellular carcinoma.