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CA: A Cancer Journal for Clinicians, Vol 42, Issue 4 198-211, Copyright © 1992 by American Cancer Society
P. J. Littrup, F. Lee and C. Mettlin
Screening for prostate cancer represents a clinical dilemma with no clear
evidence to suggest decreased mortality from any diagnostic test. We now
possess new knowledge regarding optimal combinations of DRE, TRUS, and PSA.
While DRE and TRUS may be too subjective and PSA too nonspecific, their
combined predictive values identify not only men at high risk but also
those for whom continued frequent screening may not be cost effective. A
monoclonal PSA decision level of no more than 4.0 ng/ml should be used,
since 40 percent of cancers detected from 4.0 to 10.0 ng/ml already have
extracapsular extension. Assuming that DRE is performed by experienced
examiners, the combination of PSA and DRE should produce cost-effective
early detection and minimize missed cancers below 4.0 ng/ml. TRUS should be
reserved for those patients with either PSA elevations and/or DRE
abnormalities. The use of TRUS gland volume data to further modify PSA
decision levels, such as the "predicted" PSA concept, may also improve TRUS
biopsy criteria and predictive values. Prostate cancer detection can then
be objectively limited to a small percentage of the population and better
selected for earlier, more localized disease. The ultimate decrease in
mortality from screening remains to be demonstrated in randomized trials or
observed only after decades of increased public awareness about prompt
early detection combined with effective, definitive therapy.
ARTICLES
Prostate cancer screening: current trends and future implications
Department of Radiology, St. Joseph Mercy Hospital, Ann Arbor, Michigan.
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