Study Evaluating TheSafety And Efficacy Of PF-05212377 Or Placebo In Subjects With Alzheimer's Disease With Existing Neuropsychiatric Symptoms On Donepezil

This study is currently recruiting participants. (see Contacts and Locations)
Verified March 2015 by Pfizer
Information provided by (Responsible Party):
Pfizer Identifier:
First received: October 19, 2012
Last updated: March 16, 2015
Last verified: March 2015

This study will evaluate safety and efficacy of PF-05212377 in subjects with mild-to-moderate Alzheimer's Disease with existing neuropsychiatric symptoms on a stable dose of Donepezil. The 4-week run-in will minimize placebo effect. The 12-week treatment period is considered the minimum length necessary to reliably evaluate the effect PF-05212377 on cognition and and neuropsychiatric symptoms in this population. The 2-week washout will allow to monitor re-emergence of neuropsychiatric and cognitive symptoms.

Condition Intervention Phase
Alzheimer's Disease
Drug: PF-05212377 (SAM-760)
Other: Placebo
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Randomized, 18-week, Placebo-controlled, Double-blind, Parallel Group Study Of The Safety And Efficacy Of Pf-05212377 (Sam-760) In Subjects With Mild-to-moderate Alzheimer's Disease With Existing Neuropsychiatric Symptoms On A Stable Daily Dose Of Donepezil

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Change from Baseline (Week 4) to 12 weeks after the start of double-blind study medication on the ADAS-cog13 total score (Week 16) [ Time Frame: Week 16 ] [ Designated as safety issue: No ]
    ADAS-cog13 is a psychometric instrument that evaluates word recall, ability to follow commands,constructional praxis, naming, ideational praxis, orientation, word recognition, memory, comprehension of spoken language, word-finding, and language ability, with a measure of delayed word recall and concentration/ distractibility. The total score of the scale ranges from 0 to 85, with an increase in score indicating cognitive worsening.

Secondary Outcome Measures:
  • Change from baseline (Week 4) to 12 weeks after the start of double-blind study medication on the NPI total score (Week 16). [ Time Frame: Week 16 ] [ Designated as safety issue: No ]
    The NPI evaluates both frequency and severity of 12 neuropsychiatric disturbances including delusions, hallucinations, agitation/aggression, depression/dysphoria, anxiety, elation/euphoria, apathy/indifference, disinhibition, irritability/lability, motor disturbance, nighttime behaviors, as well as appetite/eating. The NPI total score is calculated as the product of frequency and severity for each domain, and ranges from 0 to 144. An increase in score indicates a worsening of symptoms.

Estimated Enrollment: 342
Study Start Date: November 2012
Estimated Study Completion Date: December 2016
Estimated Primary Completion Date: December 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 30 mg QD of PF-05212377 Drug: PF-05212377 (SAM-760)
30 mg QD of PF-05212377 (SAM-760)
Placebo Comparator: Placebo Other: Placebo
Placebo QD


Ages Eligible for Study:   60 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Clinical diagnosis of probable AD with supportive brain imaging documentation
  • Have existing neuropsychiatric symptoms as defined by a score equal or greater than 10 on the NPI at screening, arising from item scores equal or greater than 2 (frequency X severity) on at least 2 domains.
  • Has been on donepezil (stable dose of 5 mg or 10 mg) for at least four months, with no intent to change such for the duration of the study.

Exclusion Criteria:

  • Demonstrate extreme agitation, physical aggression or violence to themselves, their caregiver, or others, and/or an inability to complete the ADAS-cog assessment at Screening.
  • Have major structural brain disease other than Alzheimer's Disease
  • Other severe acute or chronical medical or psychiatric condition or laboratory abnormality
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01712074

Contact: Pfizer Call Center 1-800-718-1021

  Show 107 Study Locations
Sponsors and Collaborators
Study Director: Pfizer Call Center Pfizer
  More Information

Additional Information:
No publications provided

Responsible Party: Pfizer Identifier: NCT01712074     History of Changes
Other Study ID Numbers: B2081011, 2014-000830-42
Study First Received: October 19, 2012
Last Updated: March 16, 2015
Health Authority: United States: Food and Drug Administration

Keywords provided by Pfizer:
Double Blind
Safety and Efficacy

Additional relevant MeSH terms:
Alzheimer Disease
Brain Diseases
Central Nervous System Diseases
Delirium, Dementia, Amnestic, Cognitive Disorders
Mental Disorders
Nervous System Diseases
Neurodegenerative Diseases
Tauopathies processed this record on March 26, 2015