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

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

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Treatment effects on OS against treatment effects<br />

on Time to <strong>PSA</strong> Progression (50% rise)<br />

-0.5<br />

Effect on<br />

survival<br />

(log HR)<br />

-0.5<br />

0.0<br />

0.5<br />

1.0<br />

-0.5<br />

R 2 trial<br />

= 0.66 (CI: 0.3 – 0.85)<br />

Moderate trial-unit correlation<br />

Effect on TTPP-2 (log HR)<br />

Within patient: concordance coefficient τ = 0.61 (SE=0.02)

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