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Surrogacy Case Study: Prostate Specific Antigen (PSA ... - Isped

Surrogacy Case Study: Prostate Specific Antigen (PSA ... - Isped

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First remarks<br />

• Many of the papers (especially in the US) still rely<br />

on the Prentice Criteria for validation<br />

• Several papers are based on non randomized<br />

cohorts<br />

• Validity specific to<br />

• Disease stage<br />

• Form of summary statistic (eg: <strong>PSA</strong>-DT vs <strong>PSA</strong><br />

response for HRPC on Taxotere)<br />

• Treatment mechanism of action (HR vs Taxotere vs<br />

Other drugs)

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