Used in immunological research to study cell adhesion and signaling processes in epithelial cells. Plays a role in cancer diagnostics due to its overexpression in certain carcinomas, particularly colorectal cancer. Serves as a target for monoclonal antibody development in tumor imaging and therapy. Applied in ELISA and flow cytometry assays to detect and quantify CEA-specific immune responses. Supports the development of targeted drug delivery systems by binding to specific receptors on cancer cells.