Conflicting Prostate Screening Trials (2009)
Two large trials published the same year reached opposite conclusions. A European study of about 162,000 men reported roughly a 20% relative reduction in prostate cancer deaths with screening. A U.S. trial of about 76,000 men found no mortality benefit. The contradiction sat at the center of the screening debate for a decade.
U.S. guidance turned cautious, culminating in the 2012 recommendation against routine PSA screening.
Screening rates fell and diagnoses of advanced-stage disease later climbed, which the American Cancer Society cites as reason to screen again.
The new guideline is the society's answer to that dispute: it treats the mortality benefit as established and pushes the harm reduction into the follow-up testing step.
