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Drug Development.

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Summary
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Digital twins created from existing data enhance randomized controlled trials (RCTs) for early dementia by providing virtual controls. This method improves trial rigor and offers personalized treatment evaluation without controversial placebo groups.

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Area of Science:

  • Neuroscience
  • Clinical Trials
  • Biotechnology

Background:

  • Ethical concerns arise with placebo use in dementia trials due to new FDA-approved treatments.
  • Digital twin (virtual control) technology offers a personalized approach to evaluating treatment effects.
  • The feasibility of digital twin techniques in clinical research remains largely unexplored.

Purpose of the Study:

  • To assess the feasibility and efficacy of using digital twins as controls in early-phase dementia clinical trials.
  • To compare the effectiveness of digital twin control methods against traditional randomized controlled trial (RCT) designs.
  • To evaluate conversational interactions' impact on cognition in older adults using digital twins.

Main Methods:

  • A randomized controlled trial (RCT) involving 186 participants aged ≥75 with normal cognition or mild cognitive impairment.
  • Digital twins were generated using National Alzheimer's Coordinating Center-Uniform Data Set (NACC-UDS) data via twin mapping and random forest modeling.
  • Cognitive outcomes (MoCA, CFA) were compared between original trial data and digital twin controls at 6-month follow-up.

Main Results:

  • Treatment effect sizes for MoCA and CFA in parallel-group designs closely aligned between original and digital twin-control trials.
  • For n-of-1 designs, both digital twin methods showed substantial agreement in identifying treatment responders.
  • Approximately 10% of NACC-UDS participants were eligible for generating digital twins.

Conclusions:

  • Digital twins derived from public datasets can significantly enhance the rigor of early-phase dementia RCTs.
  • This approach provides a valid alternative to traditional control groups, enabling personalized treatment evaluation.
  • Digital twin technology shows promise for improving the design and ethical considerations of dementia research.