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Aligning Estimators With Estimands in Clinical Trials: Putting the ICH E9(R1) Guidelines Into Practice
C H Mallinckrodt1, J Bell2, G Liu3
1Biogen, Cambridge, MA, USA.
This paper details estimators for clinical trials that align with ICH E9(R1) guidelines on estimands and intercurrent events. It emphasizes how justifiable assumptions impact the robustness of estimates, crucial for reliable interpretation.
Area of Science:
- Clinical trial methodology
- Statistical analysis in pharmaceuticals
- Regulatory science
Background:
- The International Council for Harmonisation (ICH) E9(R1) guideline addresses estimands and handling of intercurrent events in clinical trials.
- Ensuring estimates are interpretable and robust is critical for regulatory submissions.
- Unverifiable assumptions can impact the reliability of statistical estimates.
Purpose of the Study:
- To provide conceptual and technical details for estimators aligning with the draft ICH E9(R1) addendum.
- To explore strategies for handling intercurrent events in statistical analyses.
- To examine the influence of assumption nature and extent on estimator robustness.
Main Methods:
- Review of the draft ICH E9(R1) addendum's stipulations on estimands and assumptions.
- Conceptual considerations for various statistical estimators.
- Technical details for implementing estimators aligned with regulatory guidance.
- Analysis of how different assumptions affect the robustness of estimates.
Main Results:
- The paper outlines 5 strategies for managing intercurrent events as specified in the draft addendum.
- It highlights the critical role of justifiable and plausible assumptions in ensuring estimate robustness.
- The influence of the extent and nature of assumptions on estimator reliability is discussed.
Conclusions:
- Aligning estimators with estimands and justifiable assumptions is key for reliable clinical trial interpretations.
- Understanding the impact of assumptions on robustness is essential for robust statistical analyses.
- The paper offers practical insights for statisticians navigating the ICH E9(R1) addendum.
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