CEACAM5 and colorectal cancer: Dawson et al [91] evaluated 43 patients undergoing surgery with primary colorectal cancer and 9 patients undergoing second look laparotomy for recurrent colorectal cancer who were intravenously injected with 2 mCi (74 MBq) of 125I-anti-CEA monoclonal antibody (125I-A5B7) three to ten days before surgery.