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前列腺特异性抗原（ＰＳＡ）作为前列腺癌（Ｐｃａ）的癌标已有十几年，其最大局限性在于不能明确区分良性前列腺疾病与Ｐｃａ。为提高其特异性与敏感性，最近对游离ＰＳＡ的百分率进行了研究。本文就近年来的有关研究资料进行综述。
Prostate specific antigen (PSA) has been a cancer marker for prostate cancer (Pca) for more than a decade, and its biggest limitation is the inability to clearly differentiate benign prostate disease from Pca. To increase their specificity and sensitivity, the percentage of free PSA has recently been studied. This article reviews the research data in recent years.