CASE 04
Recovering Interpretability in a Confounded Clinical Trial
A post-database-lock recovery when unexpected rescue-medication use threatened interpretation of efficacy results.
Case Overview
Why this case mattered
A completed randomized trial became difficult to interpret after database lock because rescue-medication use was substantially higher and more uneven than anticipated. TUNECT's role was to recover decision value without rewriting the study history.
Model updated
identified confounding incorporated into efficacy analyses
Post-hoc package
additional analyses planned and documented
Publication support
limitations translated into a usable reporting package
The Challenge
What TUNECT walked into
Rescue medication was permitted by protocol, but the original SAP did not plan adjustment for rescue-use intensity. Final data review showed substantial variation across subjects and sites, creating a real risk that treatment effects on pain outcomes could be masked or distorted.
Our Approach
How the project was handled
01
Statistical re-specification
Updated the ANCOVA strategy to incorporate rescue-medication count as a continuous covariate for relevant efficacy analyses.
02
Governance + traceability
Documented deviations and rationale formally, aligned reporting conventions and maintained a transparent audit trail.
03
Post-hoc + writing support
Ran targeted additional analyses and supported a publication-oriented package that explained the limitations consistently.
The goal was not to rewrite history. The goal was to preserve interpretability while making the analytical deviation and its limitations explicit.
Outcome
What changed
Interpretability improved
The impact of the confounding factor could be quantified and incorporated into treatment-effect estimation.
Audit trail preserved
Changes were documented as deviations rather than silently replacing the original planned analysis.
Decision value recovered
The Sponsor retained a defensible basis for interpretation and publication with appropriate limitations.