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Low percentage of free prostate-specific antigen (PSA) is a strong predictor of later detection of prostate cancer among Japanese men with serum levels of total PSA of 4.0 ng/mL or less.
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Measurement of total and free prostate specific antigen (PSA) in human serum samples using an ultra-microanalytical system - ScienceDirect
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Prostate Specific Antigen as a Tumor Marker in Prostate Cancer: Biochemical and Clinical Aspects | SpringerLink
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