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用１３１Ｉ标记抗癌胚抗原单克隆抗体（ＣＥＡＭｃＡｂ）对临床难于诊断和处理的大肠癌腹内复发病变行放射免疫显像（ＲＩＩ）．１１例患者中１０例为阳性，ＲＩＩ共检出≥２ｃｍ的癌症灶１７／１８处，假阳性、假阴性各１处．故其对≥２ｃｍ癌症灶的探测灵敏度和阳性图像的实际符合率均为９４．４％．ＲＩＩ对血ＣＥＡ阴性、隐匿性复发和腹内广泛播散者均有较高的诊断价值．ＲＩＩ还能判断复发癌是否侵犯膀胱．
131I-labeled anti-carcinoembryonic antigen monoclonal antibody (CEAMcAb) was used to perform radioimmunoimaging (RII) on the intra-abdominal recurrent lesions of colorectal cancer that are difficult to diagnose and treat. Ten of the 11 patients were positive, and RII detected a total of 17/18 cancer foci ≥2cm, with 1 false positive and 1 false negative. Therefore, the detection accuracy of the ≥2cm cancer foci and the actual coincidence rate of positive images were both 94.4%. RII is of high diagnostic value for blood CEA negative, occult recurrence, and widespread intra-abdominal dissemination. RII can also determine whether recurrent cancer invades the bladder.