An Efficacy and Safety Study of Lanabecestat (LY3314814) in Early Alzheimer's Disease

Change From Baseline on the Alzheimer´s Disease Cooperative Study Activities of Daily Living Inventory Instrumental Items (ADCS-iADL)

The ADCS-ADL is a 23-item inventory developed as a rater-administered questionnaire answered by the participant's caregiver. The ADCS-ADL measures both basic and instrumental activities of daily living by participants. The range for the ADCS-iADL is 0-59 with higher scores reflecting better performance. LS Mean was determined by MMRM model with factors for treatment, visit, treatment-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, pooled country, and covariates for baseline for baseline iADL score, age at baseline, and baseline iADL score-by-visit interaction.

Time frame: Baseline, Week 104

Change From Baseline on the Functional Activities Questionnaire (FAQ) Score

FAQ is a 10-item, caregiver-based questionnaire and was administered to the study partner who was asked to rate the participant's ability to perform a variety of activities ranging from writing checks, assembling tax records, shopping, playing games, food preparation, traveling, keeping appointments, traveling out of neighborhood, keeping track of current events and understanding media. FAQ total score was calculated by adding the scores from each of the 10 items. Each activity is rated on a scale from 0 to 3 (Never did and would have difficulty now = 1; Never did \[the activity\] but could do now = 0; Normal = 0; Has difficulty but does by self = 1; Requires assistance = 2; Dependent = 3). FAQ scale is 0 to 30, with higher scores indicating greater impairment. LS Mean was calculated by MMRM with factors for treatment, visit, treatment-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline and pooled country.

Time frame: Baseline, Week 104

Change From Baseline on the Integrated Alzheimer's Disease Rating Scale (iADRS) Score

The iADRS is a composite that measures both cognition and function. The iADRS comprises scores form the ADAS- Cog and the ADCS-iADL. The iADRS is calculated as a linear combination of the total scores of the ADAS-Cog13 (score range 0 to 85 with higher scores reflecting worse performance) and the ADCS-iADL (score range from 0-59 with higher scores reflecting better performance). The iADRS score ranges from 0 to 144 with higher scores indicating greater impairment. LS Mean was determined by MMRM methodology with factors for treatment, visit, treatment-by- visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, pooled country, and covariates for baseline iADRS13 total score, age at baseline, and baseline iADRS13 total score-by-visit interaction.

Time frame: Baseline, Week 104

Change From Baseline on the Clinical Dementia Rating - Sum of Boxes (CDR-SB) Score

The CDR-SB is a rater administered scale and impairment is scored in of the following categories: memory, orientation, judgment and problem solving, community affairs, home and hobbies and personal care. Impairment is scored on a scale in which no dementia = 0, questionable dementia = 0.5, mild dementia = 1, moderate dementia = 2 and severe dementia = 3. The 6 individual category ratings, or "box scores", were added together to give the CDR-Sum of Boxes which ranges from 0-18, with higher scores indicating greater impairment. LS Mean was determined by MMRM methodology with factors for treatment, visit, treatment-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, pooled country, and covariates for baseline CDR-SB score, age at baseline, and baseline CDR-SB score-by-visit interaction.

Time frame: Baseline, Week 104

Time to Progression as Measured by Loss of Clinical Dementia Rating (CDR) Global Score Stage

The CDR global score is a composite score calculated using the Washington University CDR-assignment algorithm applied to the 6 individual domain box scores (Morris 1993). The memory domain is considered the primary category that drives the CDR global outcome, and all other domains are secondary. The CDR global score ranges from 0 to 3 (0 = no dementia, 0.5 = questionable dementia, 1 = mild dementia, 2 = moderate dementia, 3 = severe dementia).

Time frame: Baseline through Loss of 1 Global Stage or Week 104

Change From Baseline in Neuropsychiatric Inventory (NPI) Score

The NPI is a questionnaire administered to caregivers that quantifies behavioral changes. Each of the 12 behavioral domains the caregiver reports as present are scored for Frequency, scale: 1 (Occasionally) to 4 (Very Frequently), and Severity, scale: 1 (Mild) to 3 (Severe). If the domain is reported by the caregiver as 'Not Affected,' that domain is scored as 0. The individual domain scores are calculated by multiplying the frequency times the severity for each domain. NPI Total Score is calculated by adding the individual domain scores together for all 12 domains, with a scores range from 0 to 144, with higher scores indicating greater severity of neuropsychiatric disturbance. LS Mean was determined by MMRM methodology with factors for treatment, visit, treatment-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, pooled country, and covariates for baseline NPI score, age at baseline, and baseline NPI score-by-visit interaction.

Time frame: Baseline, Week 104

Change From Baseline on the Mini-Mental State Examination (MMSE)

The MMSE is an instrument used to assess a participant's global cognitive function. The MMSE assesses orientation to time and place, immediate and delayed recall of words, attention and calculation, language (naming, comprehension and repetition), and spatial ability (copying a figure). The range for MMSE total Score is 0 to 30, with a higher score indicating better cognitive performance. LS mean was determined by MMRM methodology with factors for treatment, visit, treatment-by-visit interaction, disease status at baseline, APOE4 status, AChEI use at baseline, pooled country, and covariates for baseline MMSE total score, age at baseline, and baseline MMSE total score-by-visit interaction.

Time frame: Baseline, Week 104

Pharmacodynamics (PD): Percent Change From Baseline in Concentration of Cerebrospinal Fluid (CSF) Biomarker Amyloid Beta (Aβ)1-42

Concentration of the peptide Aβ 1-42 in plasma measured by validated immunoassay. LS Mean was determined by Analysis of covariance (ANCOVA) with last observation carried forward (LOCF), terms for treatment, baseline biomarker and age at baseline.

Time frame: Baseline, Week 97

PD: Percent Change From Baseline in Concentration of CSF Biomarker Aβ1-40

Concentration of the peptide Aβ 1-40 in plasma measured by immunoassay. LS Mean was determined by ANCOVA with LOCF (last observation carried forward), terms for treatment, baseline biomarker and age at baseline.

Time frame: Baseline, Week 97

Change From Baseline in CSF Total Tau

Cerebrospinal fluid samples are collected for analysis of concentration total tau. LS Mean was determined by ANCOVA with LOCF and with factors for treatment, disease status at baseline, baseline biomarker and age at baseline.

Time frame: Baseline, Week 97

Change From Baseline in CSF Phosphorylated Tau

Cerebrospinal fluid samples are collected for analysis of concentrations of phosphorylated tau. LS Mean was determined by ANCOVA with LOCF and with factors for treatment, disease status at baseline, baseline biomarker and age at baseline.

Time frame: Baseline, Week 97

Change From Baseline in Brain Amyloid Burden Using Florbetapir Amyloid Positron Emission Tomography (PET) Scan

Amyloid deposition in the brain is one of the defining neuropathologic findings of Alzheimer's disease. Florbetapir exhibits high affinity specific binding to amyloid plaques. The change from baseline was measured as average standard uptake value ratio (SUVr) in prespecified regions of interest (ROI) assessed by florbetapir amyloid PET imaging in a subset of participants. The Centiloid scale standardizes quantitative brain amyloid PET results to allow cross-tracer and cross-methodology comparisons. The Centiloid scale anchor points are 0 and 100, where 0 represents a high-certainty amyloid negative scan and 100 represents the amount of global amyloid deposition found in a typical AD scans. Florbetapir SUVr was converted to the Centiloid scale using the following conversion: Florbetapir Centiloids = 183 x SUVr - 177. LS Mean was determined by ANCOVA methodology with factors for treatment, disease status at baseline, baseline biomarker and age at baseline.

Time frame: Baseline, Week 104

Change From Baseline in Tau PET ((Flortaucipir F18)

Tau PET tracer (flortaucipir F18) longitudinal study measured whether lanabecestat, in participants with mild AD dementia, affected tau density and distribution over time. The outcome reported is the composite summary of the standard uptake value ratio (SUVR) normalized to the signal intensity in white matter. Annualized change is derived as change at LOCF divided by (LOCF date - baseline date) multiplied by 365. LS Mean was determined by ANCOVA methodology with factors for treatment, disease status at baseline, baseline biomarker and age at baseline. Baseline defined to be within 28 days of starting study drug.

Time frame: Baseline, Week 104

Change From Baseline in Brain Metabolism Using Fluorodeoxyglucose (FDG)

Fluorodeoxyglucose (FDG) PET evaluates the regional brain metabolic rates for glucose as a sensitive, in vivo metabolic index of brain function. The outcome reported is the composite summary of the standard uptake value ratio (SUVR) normalized to the pons + vermis assessed with composite meta and composite meta automated anatomical labeling atlas (ALL). Annualized change is derived as change at LOCF divided by (LOCF date - baseline date) multiplied by 365. LS Mean was determined by ANCOVA methodology with factors for treatment, disease status at baseline, baseline biomarker and age at baseline. Baseline defined to be within 28 days of starting study drug.

Time frame: Baseline, Week 104

Change From Baseline in Whole Brain Volume

Magnetic resonance imaging (MRI) was used to evaluate the effect of lanabecestat on whole brain volumes. Annualized change is derived as change at LOCF divided by (LOCF date - baseline date) multiplied by 365. LS Mean was determined by ANCOVA methodology with factors for treatment, baseline vMRI, intracranial volume, disease status at baseline and age at baseline.

Time frame: Baseline, Week 104

Pharmacokinetics (PK): Plasma Concentration of Lanabecestat

Time frame: Week 4, post dose prior to departure from the clinic