A Study of Semagacestat for Alzheimer's Patients

The cognitive subscale of the ADAS (ADAS-Cog11) consists of 11 items assessing areas of function most typically impaired in Alzheimer's Disease (AD): orientation, verbal memory, language, and praxis. The scale ranges from 0 to 70, with higher scores indicating greater disease severity.

The ADCS-ADL is a 23-item inventory developed as a rater-administered questionnaire answered by the participant's caregiver. It measures both basic and instrumental activities of daily living. The total score ranges from 0 to 78, with lower scores indicating greater disease severity.

Concentration of amino acid peptide known as Aβ 1-42 in plasma. Least Square (LS) Mean value was controlled for baseline value, age, and investigator.

The vMRI assessment of right hippocampal and left hippocampal volume is reported. Least Square (LS) Mean value was controlled for baseline value, age, and investigator.

A radioactive tracer for PET that is a ligand for amyloid called [18F]-AV-45. This permits the visualization of amyloid in the brains of Alzheimer's participants. The outcome reported is the composite summary of the standard uptake value ratio for the cerebellar gray matter. Least Squares (LS) Mean value was controlled for baseline value, age, and investigator. Due to insufficient sample size, this analysis was not done.

The cognitive subscale of the ADAS (ADAS-Cog11) consists of 11 items assessing areas of function most typically impaired in Alzheimer's Disease (AD): orientation, verbal memory, language, and praxis. The scale ranges from 0 to 70, with higher scores indicating greater disease severity. Least Square (LS) Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

ADAS-Cog12 is the ADAS-Cog11 augmented with the delayed free recall measure, resulting in a total score ranging from 0 to 80. Higher scores indicate greater disease severity. Least Square (LS) Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

The ADAS-Cog14 is the ADAS-Cog11 augmented with delayed free recall, digit cancellation, and maze completion measures. A score of 0 to 10 for delayed free recall and a conversion code of 0 to 5 for digit cancellation and maze completion provide total score ranges for this extended ADAS-Cog14 of 0 to 90. Higher scores indicate greater disease severity. Least Square (LS) Mean value was controlled for the baseline value, age, investigator, and concomitant standard of care (SOC) medication.

The ADCS-ADL is a 23-item inventory developed as a rater-administered questionnaire answered by the participant's caregiver. It measures both basic and instrumental activities of daily living. The total score ranges from 0 to 78, with lower scores indicating greater disease severity. Least Square (LS) Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

ADAS-Cog12 is the ADAS-Cog11 augmented with the delayed free recall measure, resulting in a total score ranging from 0 to 80. Higher scores indicate greater disease severity.

The ADAS-Cog14 is the ADAS-Cog11 augmented with delayed free recall, digit cancellation, and maze completion measures. A score of 0 to 10 for delayed free recall and a conversion code of 0 to 5 for digit cancellation and maze completion provide total score ranges for this extended ADAS-Cog14 of 0 to 90. Higher scores indicate greater disease severity.

The CDR-SB is a semi-structured interview of participants and their caregivers. The participant's cognitive status is rated in 6 domains of functioning, including memory, orientation, judgment and problem solving, community affairs, home and hobbies, and personal care. A severity score is assigned for each of the 6 domains with total score ranging from 0 to 18. Higher scores indicate greater disease severity. Least Square (LS) Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

The MMSE is a brief screening instrument used to assess cognitive function in elderly participants. It assesses orientation, memory, attention, and ability to name objects, follow verbal and written commands, write a sentence, and copy figures. The total score ranges from 0 to 30, with a lower score indicating greater disease severity. Least Square (LS) Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

The NPI is a tool for assessing psychopathology in patients with dementia and other neurologic disorders. Information is obtained from a caregiver familiar with the patient's behavior. The score ranges from 12 to 144, with higher scores indicating greater disease severity. Least Square (LS) Mean value was controlled for the baseline value, age, investigator, concomitant standard of care medication.

EQ-5D (proxy version) measures mobility, self-care, usual activities, pain/discomfort, anxiety/depression; each has 3 severity levels (no, some, severe problems) coded to a 1-digit number (1-3). Digits are combined into 5-digit number describing health state. Numbers 1-3 are not added for total score. Visual Analog Scale (VAS) assesses caregiver's impression of participant's overall health state; VAS scores range=0-100, with lower scores indicating greater disease severity. LS Mean value was controlled for baseline value, age, investigator, and concomitant standard of care (SOC) medication.

RUD-Lite assesses the healthcare resource utilization of participants and their caregivers to determine the level of formal and informal care attributable to Alzheimer's Disease (AD). Information on both caregivers (caregiving time, work status) and participants (accommodation and healthcare resource utilization) is collected from the baseline and follow-up interviews. Reported the change in number of hospitalizations per participant to week 12.