The Progressive Supranuclear Palsy Clinical Trial Platform - Regimen B: LM11A-31

April 24, 2026 updated by: Adam Boxer
The Progressive Supranuclear Palsy Clinical Trial Platform (PTP) is a multi-center, multi-regimen clinical trial evaluating the safety and efficacy of investigational products for the treatment of PSP. Regimen B will evaluate the safety and efficacy of a single study drug, LM11A-31, in participants with PSP.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

The Progressive Supranuclear Palsy Clinical Trial Platform (PTP) is designed as a perpetual platform trial. This means that there is a single Master Protocol dictating the conduct of the trial. The PTP Master Protocol is registered as NCT07173803. Once a participant enrolls into the Master Protocol and meets all eligibility criteria, the participant will be eligible to be randomized into any currently enrolling regimen. All participants will have an equal chance to be randomized to all regimens that are active at the time of screening. If a participant is randomized to Regimen B: LM11A-31, participants will complete a baseline assessment and be randomized in a 3:1 ratio to either active LM11A-31 or matching placebo. Participants must first enroll into the Master Protocol and be eligible to participate in the Master Protocol before being able to be randomly assigned to Regimen B. For a list of enrolling sites, please see the PTP Master Protocol under NCT07173803.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
147

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Clinical diagnosis of possible or probable PSP Richardson's Syndrome as defined by the 2017 Movement Disorder Society (MDS) criteria.
  2. Presence of PSP symptoms for ≤5 years at screening (based on the best judgment of the site PI).
  3. Mini-Mental State Examination (MMSE) score at screening of ≥25.
  4. Able to walk at least 10 steps with minimal assistance (e.g., one arm for safety, but not postural support).
  5. Stable doses of permitted medications as described per protocol for 30 days prior to screening.
  6. Resides at home or in the community (assisted living is acceptable).
  7. As assessed by the site PI, participant is likely to be able to comply with the protocol for the duration of the study, and has adequate vision, hearing (hearing aid permitted), and literacy (English or Spanish) sufficient for compliance with the required testing procedures.

Exclusion Criteria:

  1. Females who are breastfeeding or pregnant (as documented by a urine pregnancy test) during screening, or plan to become pregnant during the study.
  2. Females of childbearing potential who did not use a highly effective method of contraception within 28 days of screening and/or are not willing to use a highly effective method of contraception for the duration of their participation in the study.
  3. Lacks good venous access such that multiple blood draws would be precluded.
  4. Weighs less than 40kg, or more than 136kg at screening.
  5. Blood transfusion within 4 weeks of screening.
  6. Contraindications to MRI studies, including metal (ferromagnetic) implants, a cardiac pacemaker that is not compatible with MRI, and/or severe claustrophobia.
  7. Screening MRI scan showing structural evidence of alternative pathology not consistent with PSP that could explain a substantial portion of the participant's symptoms as indicated by the central MRI read.
  8. Any unstable and/or clinically significant medical condition likely to hamper the evaluation of safety and/or efficacy of study drug (e.g., clinically significant reduction in serum B12 or folate levels, clinically significant abnormalities of thyroid function, stroke, or other cerebrovascular or cardiovascular conditions), as per the site PI's judgment.
  9. History of severe allergic reaction (e.g., anaphylaxis) including but not limited to: severe allergic reaction to previous vaccines, foods, and/or medications.
  10. Hospitalization within 30 days prior to screening or baseline.
  11. Infections or major surgical procedures within 3 months prior to screening, judged to be clinically significant by the site PI.
  12. Myocardial infarction within 1 year prior to baseline, unstable angina pectoris, symptomatic congestive heart failure.
  13. History of cancer within the past 5 years other than treated skin squamous cell carcinoma, basal cell carcinoma, and melanoma in-situ, localized prostate cancer not requiring treatment, or prostate or breast cancer, which have been fully removed and are considered cured.
  14. History or presence of immunological or inflammatory conditions, including neurological disorders, meningitis or meningoencephalitis.
  15. History or presence of epilepsy requiring ongoing use of antiepileptic medications. Antiepileptic medications are permitted for pain or psychiatric use per the protocol.
  16. DSM-5 criteria for drug or alcohol abuse or dependence currently met within the past 5 years.
  17. Clinically significant abnormal vital signs including sustained sitting blood pressure >160/100 mm Hg.
  18. Diabetes mellitus with hemoglobin A1c (HbA1c) levels of ≥8.0%.
  19. Known history of human immunodeficiency virus (HIV-1 or 2).
  20. Known history of acute/chronic hepatitis B or C unless treated curatively.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Matching Placebo
Drug: Matching Placebo
Matching placebo is administered orally twice daily.
Experimental: Regimen B: LM11A-31
Drug: LM11A-31
LM11A-31 is administered orally twice daily.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Disease progression
Time Frame: 52 weeks
Change in disease severity as measured by the 15-item modified Progressive Supranuclear Palsy Rating Scale (mPSPRS-15) in which the minimum score is 0 and the maximum score is 52, with higher scores indicating a worse outcome.
52 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Disease progression
Time Frame: 52 weeks
Change in disease severity as measured by the 10-item modified Progressive Supranuclear Palsy Rating Scale (mPSPRS-10) in which the minimum score is 0 and the maximum score is 30, with higher scores indicating a worse outcome.
52 weeks
Disease progression
Time Frame: 52 weeks
Change in disease severity as measured by the 28-item Progressive Supranuclear Palsy Rating Scale (28-item PSPRS) in which the minimum score is 0 and the maximum score is 100, with higher scores indicating a worse outcome.
52 weeks
Experiences of daily living
Time Frame: 52 weeks
Change in experiences of daily living over time as measured by the Cortical Basal ganglia Functional Scale (CBFS) in which the minimum score is 0 and the maximum score is 124, with higher scores indicating a worse outcome.
52 weeks
Activities of daily living
Time Frame: 52 weeks
Change in activities of daily living over time as measured by the Schwab and England Activities of Daily Living Scale (SE-ADL) in which the minimum score is 0% and the maximum score is 100%, with lower scores indicating a worse outcome.
52 weeks
Disease severity
Time Frame: 52 weeks
Change in disease severity over time as measured by the Clinical Global Impression of disease severity (CGIds) using a 7-point scale, ranging from 1 (normal, not ill) to 7 (extremely ill), with a higher score indicating a worse outcome.
52 weeks
Disease progression
Time Frame: 52 weeks
Change in disease severity over time as measured by the Clinical Global Impression of Change (CGIC) using a 7-point scale, ranging from 1 (very much improved) to 7 (very much worse), with a score of 4 indicating no change.
52 weeks
Health-related quality of life
Time Frame: 52 weeks
Change in quality of life over time as measured by the EuroQoL 5 Dimension - 5 Level (EQ-5D-5L) questionnaire in which the minimum score is 0 and the maximum score is 1, with lower scores indicating a worse outcome.
52 weeks
Brain volume
Time Frame: 52 weeks
Change in volume in midbrain, pontine and other regions over time as measured by volumetric MRI.
52 weeks
Neurodegeneration
Time Frame: 52 weeks
Change in plasma neurofilament light chain (NfL) concentration.
52 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Adam Boxer

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Massachusetts General Hospital
University of California, San Diego
National Institute on Aging (NIA)
University of Southern California
Alzheimer's Therapeutic Research Institute
Alzheimer's Clinical Trials Consortium
PharmatrophiX Inc.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Adam Boxer, MD, PhD, University of California, San Francisco
  • Principal Investigator: Anne-Marie Wills, MD, Massachusetts General Hospital
  • Principal Investigator: Irene Litvan, MD, University of California, San Diego
  • Principal Investigator: Julio Rojas-Martinez, MD, PhD, University of California, San Francisco

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 30, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 28, 2030

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 28, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 24, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 24, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 4, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
April 27, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 24, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ATRI-015-B
  • R01AG085029 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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