Prostate-Specific Antigen (PSA) is a protein produced by both normal and malignant cells of the prostate gland. PSA testing is commonly used as a screening tool for prostate cancer.
Elevated levels of PSA in the blood can indicate the presence of prostate cancer, but they can also be caused by other conditions, such as benign prostatic hyperplasia (BPH) or prostatitis (inflammation of the prostate).
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