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癌胚抗原（ｃａｒｃｉｎｏｅｍｂｒｙｏｎｉｃ ａｎｔｉｇｅｎ，ＣＥＡ）是一种复杂的糖蛋白，正常情况下存在于妊娠６个月以内胎儿的肠道、胰腺、肝脏的细胞膜上，出生后显著减少甚至消失，但发生肿瘤、组织细胞异常增殖时则又可重现。自从六十年代开展了放射免疫检查后，发
Carcinoembryonic antigen (CEA) is a complex glycoprotein that normally occurs in the membranes of the intestine, pancreas and liver of the fetus within 6 months of pregnancy. It is significantly reduced or even disappeared after birth, but tumor, When abnormal proliferation of tissue cells can reproduce. After the radioimmunoassay was launched in the 1960s,