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Identifying subjects with severe Alzheimer's Disease (AD) symptoms early in clinical trials is crucial. Three key factors significantly increase the likelihood of participants being too severe for early AD trial inclusion.

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Area of Science:

  • Neuroscience
  • Clinical Trials
  • Gerontology

Background:

  • Previous analyses indicated a high proportion of subjects in early Alzheimer's Disease (AD) trials exceeded protocol severity requirements.
  • Individual factors were identified to help recognize overly severe subjects during screening.

Purpose of the Study:

  • To evaluate the predictive performance of identified risk factors, individually and combined, in distinguishing overly severe subjects at screening.
  • To improve the accuracy of subject selection for early-stage AD clinical trials.

Main Methods:

  • Logistic regression analysis of screening and baseline data from 1,966 subjects in early AD trials.
  • Tested combinations of three dichotomous risk factors: screening Mini-Mental State Examination (MMSE) interview duration, MMSE score, and performance on confirmatory cognitive tests.

Main Results:

  • The presence of any of the three risk factors significantly increased the odds of a subject being more severe than protocol requirements.
  • Having one risk factor increased odds 2-8 times, two factors 7-13 times, and all three factors 22 times.

Conclusions:

  • A combination of screening MMSE score near thresholds, longer MMSE interview duration, and poor performance on cognitive tests identified subjects 22 times more likely to exceed baseline severity criteria.
  • This predictive model can help researchers screen out ineligible subjects before randomization, thereby maintaining clinical trial integrity.
  • Limitations include the retrospective nature and focus on MMSE data.