Prostate-specific antigen
is abbreviated as PSA and is an enzyme produced in the
epithelial cells of both benign and malignant tissue
of the prostate gland. The enzyme keeps ejaculatory
fluid from congealing after it has been expelled from
the body. Prostate-specific antigen is used as a tumor
marker to determine the presence of prostate cancer
because a greater prostatic volume, associated with
prostate cancer, produces larger amount of prostate-specific
antigen.
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