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Gleason grading system

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PCa has changed dramatically since the late<br />

1960s (type of patients)<br />

• In 1966 there was no screening for<br />

PCa other than by DRE, as serum<br />

PSA had not yet been discovered<br />

• In <strong>Gleason</strong>’s studies, the vast majority<br />

of men had advanced disease with<br />

either local extension out of the<br />

prostate on DRE or distant metastases

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