| http://www.w3.org/ns/prov#value | - Mammograms are taken to detect breast cancer, but often what the doctor is looking for is changes from previous mammograms.You do not wait until after you have prostate cancer to get a PSA. The PSA does not really say if you have prostate cancer, but often what the doctor is looking for is changes in your PSA. A rapid increase in PSA even if the level is still low is an indicator.
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