Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) are members of the carcinoembryonic antigen (CEA) gene family and the immunoglobulin superfamily.13 We have reported on the labeling of liver metastases from colorectal cancer using an anti-CEACAM antibody conjugated to a 700-nm fluorescent dye in a colon cancer liver metastases PDOX mouse model.14 The gene discussed is CEACAM5; the disease is malignant colon neoplasm.