Publications by authors named "David B Henley"
Background: Clinical diagnosis of Alzheimer disease (AD) is challenging, with a 70.9%-87.3% sensitivity and 44.
View Article and Find Full Text PDFBackground: Alzheimer's disease (AD) is associated with variable cognitive and functional decline, and it is difficult to predict who will develop the disease and how they will progress.
Objective: This exploratory study aimed to define latent classes from participants in the Alzheimer's Disease Neuroimaging Initiative (ADNI) database who had similar growth patterns of both cognitive and functional change using Growth Mixture Modeling (GMM), identify characteristics associated with those trajectories, and develop a decision tree using clinical predictors to determine which trajectory, as determined by GMM, individuals will most likely follow.
Methods: We used ADNI early mild cognitive impairment (EMCI), late MCI (LMCI), AD dementia, and healthy control (HC) participants with known amyloid-β status and follow-up assessments on the Alzheimer's Disease Assessment Scale - Cognitive Subscale or the Functional Activities Questionnaire (FAQ) up to 24 months postbaseline.
Introduction: To facilitate enrollment and meet local registration requirements, sponsors have increasingly implemented multi-national Alzheimer's disease (AD) studies. Geographic regions vary on many dimensions that may affect disease progression or its measurement. To aid researchers designing and implementing Phase 3 AD trials, we assessed disease progression across geographic regions using placebo data from four large, multi-national clinical trials of investigational compounds developed to target AD pathophysiology.
View Article and Find Full Text PDFIntroduction: Most Alzheimer's disease (AD) clinical trials enroll participants multinationally. Yet, few data exist to guide investigators and sponsors regarding the types of patients enrolled in these studies and whether participant characteristics vary by region.
Methods: We used data derived from four multinational phase III trials in mild to moderate AD to examine whether regional differences exist with regard to participant demographics, safety reporting, and baseline scores on the Mini Mental State Examination (MMSE), the 11-item Alzheimer's Disease Assessment Scale-Cognitive subscale (ADAS-cog11), the Clinical Dementia Rating scale Sum of Boxes (CDR-SB), the Alzheimer's Disease Cooperative Study-Activities of Daily Living Inventory (ADCS-ADL), and the Neuropsychiatric Inventory (NPI).
Objective: Semagacestat, a γ-secretase inhibitor, demonstrated an unfavorable risk-benefit profile in a Phase 3 study of patients with Alzheimer's disease (IDENTITY trials), and clinical development was halted. To assist in future development of γ-secretase inhibitors, we report detailed safety findings from the IDENTITY study, with emphasis on those that might be mechanistically linked to γ-secretase inhibition.
Research Design And Methods: The IDENTITY trial was a double-blind, placebo-controlled trial of semagacestat (100 mg and 140 mg), in which 1537 patients age 55 years and older with probable Alzheimer's disease were randomized.
Background: Interpreting Alzheimer's disease (AD) clinical trial (CT) outcomes is complicated by treatment dropouts and adverse events (AEs). In elderly participants, AE rates, dropouts, and deaths are important considerations as they may undermine the validity of clinical trials. Published discontinuation and safety data are limited.
View Article and Find Full Text PDFBackground: Demonstration of a disease-modifying effect of a therapeutic agent on Alzheimer's disease (AD) requires a trial lasting for at least 18 months. An understanding of expected rates of adverse events (AEs), overall discontinuations, and discontinuations due to AEs, serious AEs, and deaths would be useful in planning such trials.
Methods: We examined safety information for patients taking placebo from five published 18-month AD trials and for patients from the Alzheimer's Disease Neuroimaging Initiative study.
Background: Alzheimer's disease is thought to be caused by increased formations of neurotoxic amyloid beta (A beta) peptides, which give rise to the hallmark amyloid plaques. Therefore, pharmacological agents that reduce A beta formation may be of therapeutic benefit.
Objective: This paper reviews the pharmacology and chemical efficacy of an A beta-lowering agent, semagacestat (LY450139).
Objective: To evaluate the efficacy of olanzapine/fluoxetine combination (OFC) versus olanzapine or fluoxetine monotherapy across all clinical trials of treatment-resistant depression sponsored by Eli Lilly and Company.
Method: Efficacy and safety data from 1146 patients with a history of nonresponse during the current depressive episode who subsequently exhibited nonresponse during a 6- to 8-week antidepressant open-label lead-in phase and were randomly assigned to OFC (N = 462), fluoxetine (N = 342), or olanzapine (N = 342) for double-blind treatment were analyzed. All patients had a diagnosis of major depressive disorder as defined by DSM-III or DSM-IV criteria.
Objective: Two parallel, 8-week double-blind studies compared olanzapine/fluoxetine combination, olanzapine, and fluoxetine in outpatients with treatment-resistant depression (TRD).
Method: Treatment-resistant depression was defined as a documented history of current-episode antidepressant failure plus a prospective failure on fluoxetine. Following an 8-week fluoxetine lead-in, 605 nonresponders with DSM-IV major depressive disorder were randomly assigned to olanzapine/fluoxetine combination, olanzapine, or fluoxetine.