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肿瘤标志物通常分为特异性标志物和广谱标志物,前者主要针对某一特定癌种,而后者则提示可能有患癌风险。对于卵巢癌来说,目前常用的肿瘤标志物包括:CA125 (cancer antigen 125,癌抗原125)、HE4 (human epididymis protein 4,人附睾蛋白4) 和 CEA (carcinoembryonic antigen,癌胚抗原)。 其中,CA125 是目前公认应用于临床的卵巢癌特异性肿瘤标志物。CA125 是一种糖蛋白,分子量为 200 KD,含 24% 碳水化合物,健康人群含量很低,上限为 35 KU/L。
\n\nCA125 特异性不够理想,不宜用于筛查,但可联合超声或其他标志物提高筛查特异性,主要应用于骨盆包块的鉴别诊断以及疗效观察。绝经后女性 CA125 大于 95 KU/L,而在第一个化疗周期后,CA125 水平如果能够降至原来的 1/10,表明病情转归良好;反之,若其水平升高则表明预后不佳。
\n\nHE4 检测在卵巢癌的早期诊断中具有一定优势,目前主要应用于卵巢良、恶性肿瘤的鉴别诊断,也可应用于疗效监测。而 CEA 作为一种广谱肿瘤标志物,其升高见于包括卵巢癌在内的多种癌症,与癌症的发生、进展及转归有关系。
\n\n除了上述肿瘤标志物之外,最近也报道了其他几种卵巢癌的相关标志物如激肽释放酶、骨桥蛋白等,这些指标有望成为卵巢癌筛查和监测的新标志物,具有广阔的应用前景。
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