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日益深入的广泛研究已经表明,大量的癌胚抗原(CEA)都是正常胚胎发育时由上皮组织产生的,但在正常的健康成年人仅有很少量存在。在40—60％的结肠、乳腺、肠道和其它一些癌瘤的患者,CEA的水平可以升高到正常含量的20倍。CEA在迅速发育的胚胎细胞中有何作用,以及在肿瘤病人中这种作用与CEA的重新出现究竟有何关系仍不明瞭。据美国国立卫生研究院(N1H)的统一意见会议在1980年的结论,是有肿瘤症状的病人血清CEA水平高于正常最大量的5—10倍
Extensive and extensive research has shown that a large number of carcinoembryonic antigens (CEA) are produced by epithelial tissues during normal embryonic development, but only in normal healthy adults. In 40-60% of patients with colon, breast, intestinal and other cancers, CEA levels can be increased to 20 times normal levels. It is still unclear what role CEA plays in rapidly developing embryonic cells, and what role this effect has with CEA’s reappearance in cancer patients. According to the consensus report of the National Institutes of Health (N1H) in the United States in 1980, serum CEA levels in patients with onset of symptoms were 5 to 10 times higher than normal maximum levels.