CEACAM5 and colorectal carcinoma: After this initial report, a number of anti-CEA Fab’ fragments with various radiolabels have been used in the detection of metastatic and recurrent colorectal carcinomas (Fig. 2) (Erb and Nabi, 2000; Fuster et al. 2003; Ghesani et al. 2003; Goldenberg et al. 1997; Hladik et al. 2001; Moffat et al. 1996; Sanidas et al. 2003; Willkomm et al. 2000).