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A member asked:
My man has stage 3 prostate cancer even though the blood test was negative. how could the test have been wrong?
A doctor has provided 1 answer
PSA is not perfect: Blood tests are molecules shed from the surface of a tumor into the blood. The ones available for most tumors are carbohydrate markers that are only of value for tumor response and not diagnosis. The prefix to these markers are CA 125 for ovary and CA 19.9 for pancreatic Ca. The CA refers to carbohydrate antigen. PSA is such an antigen and unreliable in about 40% of patients.
Answered 9/5/2015
3.6k views
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