Immunofluorescence staining of human CEACAM1 expressing cells from MDA-MB-468 tumor tissue using antibodies directed to the ectodomain shown in red (5F4) or the -L cytoplasmic tail of CEACAM1 (229) shown in green, showed strong expression along the invasive front of the breast tumor (Figure 9C; Upper) as compared to control secondary antibodies (Figure 9C; Lower). This evidence concerns the gene CEACAM1 and neoplasm.