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For a screening test to be optimal, once thescreening test is implemented, an initial increasein cancer incidence is expected and then a returnto prescreening rates should occur. Over time, thetest should result in an increase in incidences inlocalized cancers but a decrease in incidences inregional cancers. However, as this study shows,use of mammography for breast cancer screeningand prostate-specific antigen (PSA) evaluationfor prostate cancer screening represent less thanoptimal tests, and more intermediate case scenariosin which the incidences of both cancers haveincreased substantially while the incidences ofregional cancers have only slightly declined overtime.
For a screening test to be optimal, once the screening test is implemented, an initial increasein cancer incidence is expected and then a returnto prescreening rates should occur. However, as this study shows, use of mammography for breast cancer screening and prostate-specific antigen (PSA) evaluation for prostate cancer screening for less thantimaltimal tests, and more intermediate case scenarios in which the incidences of both cancers have been created substantially while the incidences ofregional cancers have only slightly declined overtime