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Related Experiment Videos

A perfect correlate does not a surrogate make.

Stuart G Baker1, Barnett S Kramer

  • 1Biometry Research Group, Division of Cancer Prevention, National Cancer Institute, USA. sb16i@nih.gov

BMC Medical Research Methodology
|September 10, 2003
PubMed
Summary
This summary is machine-generated.

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High correlation between surrogate and true endpoints does not guarantee accurate clinical trial results. Even with perfect correlation within groups, surrogate endpoints may lead to incorrect inferences about treatment effects.

Area of Science:

  • Biostatistics
  • Clinical Trial Design
  • Medical Research Methodology

Background:

  • A common assumption in medical research is that highly correlated surrogate endpoints accurately reflect true endpoint outcomes.
  • This belief suggests that differences in surrogate endpoints between treatment groups predict similar differences in true endpoints.

Purpose of the Study:

  • To investigate the validity of using surrogate endpoints when they are perfectly correlated with true endpoints within randomization groups.
  • To determine if high correlation alone is sufficient for reliable inference in clinical trials.

Main Methods:

  • Utilized a graphical approach plotting surrogate endpoints against true endpoints.
  • Modeled perfect correlation within each group using linear relationships with unknown slopes and intercepts.

Related Experiment Videos

  • Examined a scenario where the slope differed between experimental and control groups.

    • Main Results:

    • Demonstrated that a decrease in surrogate endpoints could correspond to an increase in true endpoints, leading to incorrect inferences.
    • Showed that even with perfect correlation, surrogate endpoints can yield the wrong conclusions.
    • Identified conditions for correct inference: coinciding group lines (Prentice Criterion) or accurate prediction from prior studies.

    Conclusions:

    • Perfect correlation between surrogate and true outcomes within randomized groups does not ensure correct inference.
    • Investigators should avoid relying solely on high correlation for conclusions regarding surrogate endpoints, especially in early-phase trials.