Risk-adjusted Phase II clinical trial
A risk-adjusted Phase II clinical trial is an early-phase efficacy design that incorporates patient baseline risk strata — such as disease severity, prognostic score, or comorbidity burden — directly into the trial's stopping rules and sample size calculations. By conditioning response targets and futility/efficacy thresholds on risk group membership, the design avoids the bias that arises when a new therapy is evaluated in a population whose prognostic mix differs from the historical control on which the null hypothesis was based.
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- Thall, P. F., & Simon, R. (1994). Practical Bayesian guidelines for phase IIB clinical trials. Biometrics, 50(2), 337–349. · DOI 10.2307/2533377
- Simon, R. (1989). Optimal two-stage designs for phase II clinical trials. Controlled Clinical Trials, 10(1), 1–10. · DOI 10.1016/0197-2456(89)90015-9
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