This cell line was obtained from a confirmed human mesothelioma case and exhibited both the ultrastructural features and immunocytochemical characteristics of mesothelial cells based on coexpression of cytokeratin and vimentin, and absence of carcinoembryonic antigen expression (Zeng et al, 1994; Fleury-Feith et al, 1995). Here, CEACAM5 is linked to mesothelioma.