2.β-人绒毛膜促性腺激素（β-HCG）在孕期由胎盘滋养层合胞体细胞合成，在生殖细胞性肿瘤病人中如β-HCG升高表明肿瘤中存在滋养层合胞体细胞克隆，常见于绒毛膜癌、精原细胞瘤或无性生殖细胞瘤，偶见于成人的胚胎性癌。
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