Trial Outcomes & Findings for A Phase 3 Efficacy Study Of Dimebon In Patients With Moderate To Severe Alzheimer's Disease (NCT NCT00912288)
NCT ID: NCT00912288
Last Updated: 2012-10-02
Results Overview
SIB developed for evaluation of cognitive function in participants, who demented to a degree that they cannot complete conventional neuropsychological testing. Test items consisted of simple, one-step commands presented with gestural cues and instructions that were repeated if necessary. SIB test consisted of 51-item scale, divided into 9 subscales: social interaction (0-6), memory (0-14), orientation (0-6), language (0-46), attention (0-6), praxis(0-8), visuospatial ability(0-8), construction(0-4), orienting to name(0-2). Total possible score:0-100; lower score = greater cognitive impairment.
TERMINATED
PHASE3
86 participants
Baseline, Week 26
2012-10-02
Participant Flow
Participant milestones
| Measure |
Dimebon
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
|---|---|---|
|
Overall Study
STARTED
|
44
|
42
|
|
Overall Study
COMPLETED
|
3
|
2
|
|
Overall Study
NOT COMPLETED
|
41
|
40
|
Reasons for withdrawal
| Measure |
Dimebon
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
|---|---|---|
|
Overall Study
Death
|
0
|
1
|
|
Overall Study
Adverse Event
|
1
|
1
|
|
Overall Study
Lost to Follow-up
|
1
|
0
|
|
Overall Study
Protocol Violation
|
1
|
0
|
|
Overall Study
Withdrawal by Subject
|
3
|
3
|
|
Overall Study
Study terminated by sponsor
|
34
|
35
|
|
Overall Study
Other
|
1
|
0
|
Baseline Characteristics
A Phase 3 Efficacy Study Of Dimebon In Patients With Moderate To Severe Alzheimer's Disease
Baseline characteristics by cohort
| Measure |
Dimebon
n=44 Participants
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
n=42 Participants
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
Total
n=86 Participants
Total of all reporting groups
|
|---|---|---|---|
|
Age, Customized
50 to 59 years
|
2 Participants
n=5 Participants
|
1 Participants
n=7 Participants
|
3 Participants
n=5 Participants
|
|
Age, Customized
60 to 69 years
|
9 Participants
n=5 Participants
|
8 Participants
n=7 Participants
|
17 Participants
n=5 Participants
|
|
Age, Customized
70 to 79 years
|
20 Participants
n=5 Participants
|
16 Participants
n=7 Participants
|
36 Participants
n=5 Participants
|
|
Age, Customized
80 to 85 years
|
10 Participants
n=5 Participants
|
9 Participants
n=7 Participants
|
19 Participants
n=5 Participants
|
|
Age, Customized
Greater than 85 years
|
3 Participants
n=5 Participants
|
8 Participants
n=7 Participants
|
11 Participants
n=5 Participants
|
|
Sex: Female, Male
Female
|
27 Participants
n=5 Participants
|
30 Participants
n=7 Participants
|
57 Participants
n=5 Participants
|
|
Sex: Female, Male
Male
|
17 Participants
n=5 Participants
|
12 Participants
n=7 Participants
|
29 Participants
n=5 Participants
|
PRIMARY outcome
Timeframe: Baseline, Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
SIB developed for evaluation of cognitive function in participants, who demented to a degree that they cannot complete conventional neuropsychological testing. Test items consisted of simple, one-step commands presented with gestural cues and instructions that were repeated if necessary. SIB test consisted of 51-item scale, divided into 9 subscales: social interaction (0-6), memory (0-14), orientation (0-6), language (0-46), attention (0-6), praxis(0-8), visuospatial ability(0-8), construction(0-4), orienting to name(0-2). Total possible score:0-100; lower score = greater cognitive impairment.
Outcome measures
Outcome data not reported
PRIMARY outcome
Timeframe: Baseline, Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
ADCS-ADLsev: 19-item scale measures basic and instrumental abilities in participant population and had good metric properties and reliability in detecting change. Individual score range: 0 to 5 for telephone, 0 to 4 for dressing, watch television, get around outside home, 0 to 3 for eating, walking, toilet, bathing, grooming, conversation/small talk, clear dishes, find personal belongings, obtain beverages, dispose of garbage, left on own, 0 to 1 for run water from and turn off faucet to wash hands, turn on and off light. Total score range: 0 to 54 lower scores=greater functional impairment.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Baseline, Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
NPI:12-domain caregiver assessment of behavioral disturbances occurring in dementia: delusions, hallucinations, agitation/aggression, depression/dysphoria, anxiety, elation/euphoria, apathy/indifference, disinhibition, irritability/lability, motor disturbance, appetite/eating, nighttime behavior. Severity(1=Mild to 3=Severe),frequency(1=occasionally to 4=very frequently) scales recorded for each domain; frequency\*severity=each domain score(range 0-12). Total score=sum of each domain score(range 0-144);higher score=greater behavioral disturbances;negative change score from baseline=improvement.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
NPI is a 12-domain caregiver assessment of behavioral disturbances occurring in dementia. Severity (1=Mild to 3=Severe) and frequency (1=occasionally to 4=very frequently) scales were recorded separately for each domain and their product gives individual domain score (range 0-12). Sum of delusions and hallucinations sub-domain scores of NPI was calculated as a measure of Alzheimer's Disease (AD) related psychosis. Total possible score range: 0-24 with higher score indicating greater behavioral disturbances.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Baseline, Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
MMSE measured general cognitive functioning: orientation, memory, attention, concentration, naming, repetition, comprehension, and ability to create a sentence and to copy two intersecting polygons. Total score derived from sub-scores; total ranged from 0 to 30, higher score indicates better cognitive state.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Week 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
Alzheimer's Disease Cooperative Study-Clinical Global Impression of Change (ADCS-CGIC) version of CIBIC-Plus was used to assess participant's overall disease severity. The corresponding baseline assessment rated participant on 7-point scale: (1) extremely severe AD to (7) no symptoms of AD. Overall impression of change from baseline was rated on a 7-point scale: 1=marked improvement; 2=moderate improvement; 3=minimal improvement; 4=no change; 5=minimal worsening; 6=moderate worsening; 7=marked worsening; all assessments are relative to baseline. Higher score = worsening of global function.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Baseline, Weeks 12, 18, 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
RUD Lite: instrument used to assess amount of both formal and informal resources used by demented participants and primary caregiver. It was completed by caregivers and compiles data on following resources: use of social services, frequency and duration of hospitalizations, all contacts with health care professionals, participant living accommodations, amount of time the caregiver spends giving care and the impact of care giving on the caregiver's job. Overall cost of care was evaluated to quantify resources utilized.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Baseline, Weeks 12, 26Population: Data for this outcome measure was collected and reported in individual participant listings but not statistically summarized for analysis due to early termination of the study.
EQ-5D: participant rated questionnaire to assess health-related quality of life in terms of a single utility score. Health State Profile component assesses level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, and anxiety and depression; 1 indicates better health state (no problems); 3 indicates worst health state. Total possible score ranged from 5 to 15; lower score indicated a better health state.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Pre-dose, 0.5 to 1.5 hours, 2.5 to 3.5 hours post-dose at Week 12Data for this Outcome Measure are not reported here because the analysis population includes participants who were not enrolled in this study. ClinicalTrials.gov is designed for reporting results from only those participants who were enrolled in the study and described in the Participant Flow and Baseline Characteristics modules.
Outcome measures
Outcome data not reported
SECONDARY outcome
Timeframe: Baseline up to Week 30 (follow-up)Population: Safety analysis set included all participants who received at least 1 dose of study medication, including partial doses.
Any untoward medical occurrence (including clinially important changes in clinical safety laboratory assessments, electrocardiograms and vital signs) in a participant who received study treatment was considered an AE without regard to possibility of causal relationship.
Outcome measures
| Measure |
Dimebon
n=44 Participants
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
n=42 Participants
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
|---|---|---|
|
Number of Participants With Adverse Events (AEs)
|
27 Participants
|
18 Participants
|
Adverse Events
Dimebon
Placebo
Serious adverse events
| Measure |
Dimebon
n=44 participants at risk
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
n=42 participants at risk
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
|---|---|---|
|
Blood and lymphatic system disorders
Anaemia
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
0.00%
0/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Cardiac disorders
Cardiomyopathy
|
0.00%
0/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
2.4%
1/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Infections and infestations
Pneumonia
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
0.00%
0/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Infections and infestations
Urinary tract infection
|
0.00%
0/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
2.4%
1/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Musculoskeletal and connective tissue disorders
Osteoarthritis
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
0.00%
0/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Nervous system disorders
Encephalopathy
|
0.00%
0/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
2.4%
1/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Vascular disorders
Poor peripheral circulation
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
0.00%
0/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
Other adverse events
| Measure |
Dimebon
n=44 participants at risk
Dimebon (latrepirdine) 10 milligram (mg) tablet orally three times a day for 1 week (titration period), followed by dimebon (latrepirdine) 20 mg tablet orally three times a day up to Week 26.
|
Placebo
n=42 participants at risk
Placebo tablet matched to 10 mg of dimebon (latrepirdine) tablet orally three times a day for 1 week (titration period), followed by placebo tablet matched to 20 mg dimebon (latrepirdine) tablet orally three times a day up to Week 26.
|
|---|---|---|
|
Gastrointestinal disorders
Nausea
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
7.1%
3/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
General disorders
Oedema peripheral
|
2.3%
1/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
7.1%
3/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Infections and infestations
Urinary tract infection
|
11.4%
5/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
4.8%
2/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
|
Psychiatric disorders
Agitation
|
11.4%
5/44
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
4.8%
2/42
The same event may appear as both an AE and a SAE. However, what is presented are distinct events. An event may be categorized as serious in one subject and as nonserious in another subject, or one subject may have experienced both a serious and nonserious event during the study.
|
Additional Information
Results disclosure agreements
- Principal investigator is a sponsor employee Pfizer has the right to review disclosures, requesting a delay of less than 60 days. Investigator will postpone single center publications until after disclosure of pooled data (all sites), less than 12 months from study completion/termination at all participating sites. Investigator may not disclose previously undisclosed confidential information other than study results.
- Publication restrictions are in place
Restriction type: OTHER