Simufilam 50 mg or 100 mg for Mild-to-Moderate Alzheimer's Disease (REFOCUS-ALZ)
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT05026177 |
Recruitment Status :
Active, not recruiting
First Posted : August 30, 2021
Last Update Posted : January 26, 2024
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Tracking Information | |||||
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First Submitted Date ICMJE | August 9, 2021 | ||||
First Posted Date ICMJE | August 30, 2021 | ||||
Last Update Posted Date | January 26, 2024 | ||||
Actual Study Start Date ICMJE | November 18, 2021 | ||||
Estimated Primary Completion Date | May 2025 (Final data collection date for primary outcome measure) | ||||
Current Primary Outcome Measures ICMJE |
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Original Primary Outcome Measures ICMJE | Same as current | ||||
Change History | |||||
Current Secondary Outcome Measures ICMJE |
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Original Secondary Outcome Measures ICMJE |
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Current Other Pre-specified Outcome Measures | Not Provided | ||||
Original Other Pre-specified Outcome Measures | Not Provided | ||||
Descriptive Information | |||||
Brief Title ICMJE | Simufilam 50 mg or 100 mg for Mild-to-Moderate Alzheimer's Disease | ||||
Official Title ICMJE | A Phase 3, Randomized, Double-blind, Placebo-controlled, Parallel-group, 76-week Study Evaluating the Safety and Efficacy of Two Doses of Simufilam in Subjects With Mild-to-Moderate Alzheimer's Disease | ||||
Brief Summary | A 76-week safety and efficacy study of simufilam (PTI-125) given twice daily to participants with mild-to-moderate Alzheimer's disease (AD) for 76 weeks. Approximately 1083 participants will be randomized (1:1:1) to receive either placebo, 50 mg tablets of simufilam, or 100 mg tablets of simufilam, twice daily, for 76 weeks. Clinic visits will occur 4 weeks after the baseline visit, and then every 12 weeks until the end of the study. The safety of simufilam, and its efficacy in enhancing cognition and slowing cognitive and functional decline will be evaluated. | ||||
Detailed Description | The primary objective of this study is to investigate the safety and efficacy of simufilam (PTI-125) in enhancing cognition and slowing cognitive and functional decline following 76-week, repeat-dose oral administration in participants with mild-to-moderate AD. Secondary objectives are to assess neuropsychiatric symptoms and to replicate the cerebrospinal fluid (CSF) biomarker effects observed in the two Phase 2 studies (PTI-125-03 and PTI-125-02) after 76 weeks of simufilam treatment. A third objective is to investigate the effect of simufilam treatment on plasma biomarkers as well as anatomical correlates of disease progression (brain volume [hippocampus, ventricles and whole brain]; and amyloid and tau deposition in the brain). A limited number of research sites will be invited to participate in sub-studies to assess the impact of simufilam on anatomical and biomarker endpoints, including: change from Baseline in CSF biomarkers (30 subjects/group); brain volume via magnetic resonance imaging (MRI) (50 subjects/group); and amyloid and tau positron emission tomography (PET) (40 and 50 subjects/group, respectively). Participants in both PET sub-studies will be required to have an MRI during the Screening Period and provide plasma for a biomarker sub-study. Participants in the tau PET sub-study will also provide additional plasma for a pharmacokinetic (PK) exposure response analysis. Changes from baseline for these imaging and fluid biomarkers represent additional secondary endpoints. The 90 subjects (30 per group) in the CSF sub-study will undergo lumbar puncture during the Screening Period and again at the Week 76 End-of-Treatment Visit to collect CSF biomarkers. Safety will be evaluated by adverse event monitoring, vital signs, clinical labs, and the Columbia Suicide Severity Rating Scale at every visit. Subjects will undergo MRI during screening to ensure entry criteria are met (unless recent MRI confirms entry criteria); however, 150 subjects (50 subjects per treatment group) will also undergo repeat MRI assessments at Weeks 40 and 76 to assess both long-term safety and drug impact on brain volume as noted above. Resting electrocardiograms will be conducted at Baseline (Study Day 1) and Weeks 4, 40 and 76. A complete physical and neurological examination will be performed at screening, and brief examinations will be performed at all other visits. Weight will be measured during the Screening Period, at Baseline (Study Day 1) and at all other visits. An independent Data Safety Monitoring Board (DSMB) will meet periodically to review subject safety assessments and determine if dosing may continue. A charter will be developed with specific guidance for the DSMB. |
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Study Type ICMJE | Interventional | ||||
Study Phase ICMJE | Phase 3 | ||||
Study Design ICMJE | Allocation: Randomized Intervention Model: Parallel Assignment Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor) Masking Description: Randomized treatments will be assigned by subject numbers in a randomly generated numeric sequence. Randomization (1:1:1) will be stratified by low or high Mini-Mental State Exam (MMSE; 16-20 and 21-27). The randomization code will not be revealed to study subjects, Investigators, clinical staff, study monitors or the Sponsor until all subjects have completed therapy and the database has been finalized and locked. |
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Condition ICMJE | Alzheimer Disease | ||||
Intervention ICMJE |
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Study Arms ICMJE |
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Publications * | Not Provided | ||||
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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Recruitment Information | |||||
Recruitment Status ICMJE | Active, not recruiting | ||||
Estimated Enrollment ICMJE |
1083 | ||||
Original Estimated Enrollment ICMJE | Same as current | ||||
Estimated Study Completion Date ICMJE | May 2025 | ||||
Estimated Primary Completion Date | May 2025 (Final data collection date for primary outcome measure) | ||||
Eligibility Criteria ICMJE | Key Inclusion Criteria:
Key Exclusion Criteria:
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Sex/Gender ICMJE |
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Ages ICMJE | 50 Years to 87 Years (Adult, Older Adult) | ||||
Accepts Healthy Volunteers ICMJE | No | ||||
Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects | ||||
Listed Location Countries ICMJE | Canada, Korea, Republic of, Puerto Rico, United States | ||||
Removed Location Countries | |||||
Administrative Information | |||||
NCT Number ICMJE | NCT05026177 | ||||
Other Study ID Numbers ICMJE | PTI-125-06 | ||||
Has Data Monitoring Committee | Yes | ||||
U.S. FDA-regulated Product |
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IPD Sharing Statement ICMJE |
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Current Responsible Party | Cassava Sciences, Inc. | ||||
Original Responsible Party | Same as current | ||||
Current Study Sponsor ICMJE | Cassava Sciences, Inc. | ||||
Original Study Sponsor ICMJE | Same as current | ||||
Collaborators ICMJE | Premier Research Group plc | ||||
Investigators ICMJE |
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PRS Account | Cassava Sciences, Inc. | ||||
Verification Date | January 2024 | ||||
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |