Prostate Cancer Screening: Free vs Total PSA
Author Information
Author(s): Wald N J, Watt H C, George L, Knekt P, Helzlsouer K J, Tuomilehto J
Primary Institution: CRC Cancer Screening Group, Department of Environmental and Preventive Medicine, Wolfson Institute of Preventive Medicine, St Bartholomew's and the Royal London School of Medicine and Dentistry
Hypothesis
Is there an advantage in measuring both free and total prostate-specific antigen (PSA) for prostate cancer screening?
Conclusion
Adding free PSA to total PSA does not provide a significant advantage in prostate cancer screening.
Supporting Evidence
- The study included 247 men who developed prostate cancer and 953 controls.
- Sensitivity for detecting prostate cancer increased from 95% to 97% when adding free PSA.
- Over a 6-year period, detection rates were 52% for total PSA and 56% for free and bound PSA.
Takeaway
This study looked at whether measuring two types of PSA helps find prostate cancer better, and it found that it doesn't really make a difference.
Methodology
Nested case-control design using data from four prospective studies with stored serum samples.
Limitations
The study may not account for all variables affecting PSA levels.
Participant Demographics
Men from the UK, Maryland (USA), and Finland.
Digital Object Identifier (DOI)
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