26 Radwan Radwan NA NA Ahmed Ahmed NS NS The diagnostic value of arginase-1 immunostaining in differentiating hepatocellular carcinoma from metastatic carcinoma and cholangiocarcinoma as compared to HepPar-1 The diagnostic value of arginase-1 immunostaining in differentiating hepatocellular carcinoma from metastatic carcinoma and cholangiocarcinoma as compared to HepPar-1 Diagn Pathol. The gene discussed is ARG1; the disease is cholangiocarcinoma.