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Alzheimers Dement (N Y). 2019 Oct 28;5:661-670. doi: 10.1016/j.trci.2019.09.010. eCollection 2019.

The TOMMORROW study: Design of an Alzheimer's disease delay-of-onset clinical trial.

Alzheimer's & dementia (New York, N. Y.)

Daniel K Burns, Carl Chiang, Kathleen A Welsh-Bohmer, Stephen K Brannan, Meredith Culp, Janet O'Neil, Grant Runyan, Patrick Harrigan, Brenda L Plassman, Michael Lutz, Eric Lai, Stephen Haneline, David Yarnall, Deborah Yarbrough, Craig Metz, Sridevi Ponduru, Scott Sundseth, Ann M Saunders

Affiliations

  1. Zinfandel Pharmaceuticals, Inc., Durham, NC, USA.
  2. Department of Neurology, Bryan Alzheimer's Disease Research Center, Duke University School of Medicine, Durham, NC, USA.
  3. Takeda Development Center Americas, Inc., Deerfield, IL, USA.
  4. Takeda Development Center Americas, Inc., Cambridge, MA, USA.

PMID: 31720367 PMCID: PMC6838537 DOI: 10.1016/j.trci.2019.09.010

Abstract

INTRODUCTION: Alzheimer's disease (AD) is a continuum with neuropathologies manifesting years before clinical symptoms; thus, AD research is attempting to identify more disease-modifying approaches to test treatments administered before full disease expression. Designing such trials in cognitively normal elderly individuals poses unique challenges.

METHODS: The TOMMORROW study was a phase 3 double-blind, parallel-group study designed to support qualification of a novel genetic biomarker risk assignment algorithm (BRAA) and to assess efficacy and safety of low-dose pioglitazone to delay onset of mild cognitive impairment due to AD. Eligible participants were stratified based on the BRAA (using

RESULTS: The focus of this paper is on the design of the study; study results will be presented in a separate paper.

DISCUSSION: The design of the TOMMORROW study addressed many key challenges to conducting a dual-objective phase 3 pivotal AD clinical trial in presymptomatic individuals. Experiences from planning and executing the TOMMORROW study may benefit future AD prevention/delay-of-onset trials.

© 2019 The Authors.

Keywords: Clinical trial design; Delay of onset; Genetic risk for AD; Mild cognitive impairment due to AD; Time to event; Trial population enrichment

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