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

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

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Prediction for a new trial – M1<br />

• R² trial for time to <strong>PSA</strong> progression (50% rise) is 0.66<br />

(95% CI:0.30 – 0.85)<br />

• Assuming a new study of 400 events leading to a HR<br />

for <strong>PSA</strong> of 0.50 (Z=-6.9, P=

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