CEACAM5 and colorectal adenocarcinoma: CEA was opposingly found to be positive in all analyzed cases of urachal adenocarcinomas and in a similarly high rate of colorectal adenocarcinomas but lower rates in primary bladder adenocarcinomas (29–67%) [21, 27, 48, 60, 67, 77, 86, 100, 106, 124, 163, 165, 245, 255, 348–353].