We have demonstrated immunohistochemically that RCAS 1 antigen is expressed in biliary neoplasms. Serum RCAS 1 levels are also elevated in a high percentage of patients with intra-hepatic cholangiocarcinoma.
Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. enjoji@intmed3.med.kyushu-u.ac.jp