癌胚抗原(简称CEA)是一种糖蛋白,1965年Cold等首先从消化道的腺癌中发现。近年来大量的研究证明,CEA并非消化道肿瘤的特异性抗原,肺癌、乳腺癌等许多肿瘤其含量增高,且其含量的变化与肿瘤的消长相平行,因此被认为是肿瘤辅助诊 Carcinoembryonic antigen (CEA) is a kind of glycoprotein. In 1965, Cold et al. first discovered from the adenocarcinoma of the digestive tract. In recent years, a large number of studies have demonstrated that CEA is not a specific antigen for digestive tract tumors, and that many tumors such as lung cancer and breast cancer are increased in content, and the changes in their content are parallel to tumor growth and are therefore considered to be tumor-assisted diagnoses.