A blood test that checks a protein made by the prostate can find cancer before you feel sick, even if it’s not perfect.
Scientific Claim
Prostate-specific antigen (PSA) levels in serum serve as a biomarker for prostate tissue abnormality, enabling detection of early-stage prostate cancer in asymptomatic individuals when anatomical obstruction has not yet occurred.
Original Statement
“PSA testing, prostate specific antigen, a protein produced by the prostate that can be measured with a simple blood test. This is why that blood test exists and matters. It's not a perfect test. Obviously, we all know that it has big limitations and I'll come back to that in a bit. But in the absence of symptoms, a PSA blood test is often the only way to detect prostate cancer at a stage when treatment is most likely to be curative.”
Context Details
Domain
oncology
Population
human
Subject
prostate-specific antigen (PSA)
Action
serves as a biomarker
Target
early-stage prostate cancer detection
Intervention Details
Evidence from Studies
Supporting (1)
This study looks at PSA levels in men who already had prostate cancer and had surgery, to see if tiny changes in PSA can predict if the cancer is coming back. It doesn’t test whether PSA can find cancer in healthy men who have no symptoms yet.