PSMA
前列腺特异性膜抗原(prostate-specificmembraneantigen,PSMA)是存在于前列腺细胞膜的一种多功能的Ⅱ型跨膜蛋白,由750个氨基酸残基组成。PSMA具有较高的前列腺组织特异性,在区分前列腺癌和其他类型恶性肿瘤的敏感度和特异性分别是65.9%和94.5%,因此PSMA仍然是前列腺癌细胞上一个相当敏感的、高度特异性的抗原物质。PSMA在前列腺组织良、恶性鉴别中优于PSA,且临床分期越晚,其表达越强,与肿瘤恶性程度成正相关。因此PSMA是较PSA更具特异性的前列腺癌瘤标志物,可作为前列腺癌预后评估的重要指标。
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