A 2-Part Study to Assess Efficacy, Safety and Tolerability of BMB-101 for the Treatment of Patients With Prader-Willi Syndrome.

A Randomized, Double-Blind, Placebo-Controlled Phase 2 Study to Assess Efficacy, Safety and Tolerability of BMB-101 Oral Solution for the Treatment of Patients With Prader-Willi Syndrome (PWS)

The goal of this clinical trial is to evaluate the safety and effects of a new drug called BMB-101 in people with Prader-Willi Syndrome (PWS). This study is designed as a multi-centre, double-blind, randomized, placebo controlled 2-part study with a blinded main phase followed up an open label extension phase.

Study Overview

• Status: Not yet recruiting
• Conditions: Prader-Willi Syndrome
• Intervention / Treatment: Drug: Placebo; Drug: BMB-101

Detailed Description

This study is designed as a 2-part study:

Part 1 is designed as a randomized phase, lasting up to 16 weeks. There will be a 4-week screening period. Following the screening period, participants will be randomized in a 1:1 ratio to either BMB-101 or placebo. Participants will enter into a weekly ascending Maximum Tolerated Dose (MTD) titration phase of 4 weeks followed by a maintenance phase of 8 weeks. There will be 5 clinic visits and 4 telephone visits.

Part 2 is designed to follow after the completion of the maintenance phase in Part 1. Participants at the discretion of the Investigator may elect to continue into an unblinded, expandable open label phase to receive BMB-101.

Participants who do not elect to continue into the open label phase will be tapered from assigned study treatment over 4 weeks following completion of the maintenance phase.

• Study Type: Interventional
• Enrollment (Estimated): 16
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Rachelle Kirk-Burnnand; Phone Number: +61 439615368; Email: rachelle@basebio.com.au

Study Locations

• Australia
  • New South Wales
    • Sydney, New South Wales, Australia, 2050
      • Royal Prince Alfred Hospital
      • Contact: Tania Markovic; Phone Number: 02 9519 7605; Email: tania.markovic@sydney.edu.au
  • Victoria
    • Melbourne, Victoria, Australia, 3004
      • Alfred Health
      • Contact: Daniel Fineberg; Phone Number: +61 411403167; Email: D.Fineberg@alfred.org.au

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Participant must be aged 18-65 years (both inclusive).
• Genetically confirmed diagnosis of Prader Willi Syndrome via standard DNA testing or other commonly approved methods.
• Willing and able to provide voluntary written informed consent, or have a Legally Authorized Representative who is able to provide consent.
• Moderate to severe hyperphagia as defined by a HQ-CT score ≥ 13 at time of randomization (Visit 3).
• If participant is receiving growth hormone, the subject must be on the same medication and stable dose for at least 90 days prior to Visit 1.
• Female participant of childbearing potential must have a negative urine pregnancy test at baseline. Participants of childbearing or child-fathering potential must be willing to use medically acceptable forms of birth control, which includes abstinence, while in this study and for 90 days after the last dose of study drug.
• Participant and/or caregiver has the ability to be compliant with study requirements, including visit schedule, diary completion and study drug accountability.
• If a caregiver assists in completion of questionnaires, the same caregiver is available to complete the questionnaires throughout the duration of the study.

Exclusion Criteria:

• Participant has used metabolic agents known to affect appetite within 3 months of Visit 1.
• Participant use of psychotropic medications including SSRIs/SNRIs, monoamine-oxidase inhibitors, tricyclic antidepressants, other serotonergic agonists or antagonists (antipsychotics), and other agents which have known Serotonin Syndrome risk (e.g. mirtazapine) within 1 month of Visit 1.
• Participant has implementation of new food restrictions or new environmental restrictions within 1 month of Visit 1.
• Participant has participated in an interventional clinical trial of any Prader-Willi Syndrome agent within 3 months of Visit 1 or any other investigational agent within 1 month of Visit 1.
• Participant has current or past history of cardiovascular or cerebrovascular disease, such as cardiac valvulopathy, pulmonary hypertension, myocardial infarction or stroke, or clinically significant structural cardiac abnormality.
• Participant has moderate or severe hepatic impairment. Asymptomatic participants with mild hepatic impairment (elevated liver enzymes < 3x upper limit of normal (ULN) and/or elevated bilirubin <2x ULN) may be entered into the study after review and approval by the Medical Monitor in conjunction with the sponsor, in consideration of comorbidities and concomitant medications.
• Participant has severe renal impairment (estimated glomerular filtration rate <30mL/min/1.73m2).
• Participant has clinically significant ECG abnormality such as QTcF >450 msec (males) or >470 msec (females).
• Participant has a history of drug or alcohol abuse within the last 12 months or a positive urine drug screen.
• A current C-SSRS score of 4 or 5 at Visit 1 or history of suicide attempt at any time during the past year.
• Participant has a clinically significant condition or has had clinically relevant symptoms or a clinically significant illness in the 4 weeks prior to Visit 1, other than PWS, that would negatively impact study participation, collection of study data, evaluation of study endpoints or pose a risk to the participant, in the opinion of the Investigator.
• Participant is pregnant (determined by a positive urine pregnancy test) or lactating female.
• Any condition that is thought to be a degenerative neurological disease.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: BMB-101; Participants receive BMB-101 (10mg/mL liquid) orally	Drug: BMB-101; Participants will receive weekly ascending oral doses of BMB-101(10 mg/mL) twice daily (BID) for 16 weeks. Doses will be based on weight (kg) and will initially start at 1.67 mg/kg. Doses may be titrated in 0.33 mg/kg increments based on tolerability up to a maximum dose of 2.0 mg/kg.
Placebo Comparator: Placebo; Participants receiving matched placebo orally	Drug: Placebo; Matched Placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change from Baseline in Hyperphagia Questionnaire for Clinical Trials scores over time in Prader-Willi Syndrome participants.	The Hyperphagia Questionnaire for Clinical Trials consists of 9 items; each rated on a scale from 0 (no symptoms) to 4 (severe symptoms). The total score ranges from 0 to 36, with higher scores indicating worse hyperphagia symptoms. A score of approximately 13 is associated with moderate to severe hyperphagia, and a score of 22 or greater is associated with severe hyperphagia.	16 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change from Baseline in hyperphagia severity score as measured by the Caregiver Global Impression of Severity 7-point scale over time.	This scale is a single-item measure from 1 to 7, where higher scores indicate greater severity.	16 weeks
Change from Baseline in hyperphagia severity score as measured by the Clinician Global Impression of Severity 7-point scale over time.	This scale is a single-item measure from 1 to 7, where higher scores indicate greater severity.	16 weeks
Change from Baseline in severity of Prader-Willi Syndrome disease scores as measured by the Clinician Global Impression of Severity 7-point scale over time.	This scale is a single-item measure from 1 to 7, where higher scores indicate greater severity.	16 weeks
Change from Baseline in improvement of Prader-Willi Syndrome disease scores as measured by the Clinician Global Impression of Improvement 7-point scale over time.	This scale is a single-item measure from 1 to 7, where 1 indicates very much improved, and 7 indicates very much worse.	16 weeks
Change from Baseline in Prader-Willi Syndrome correlated behavioral issues such as symptoms measured by the Prader-Willi Syndrome Profile on a 3-point scale over time.	The Prader-Willi Syndrome Profile is a 57-item caregiver rated questionnaire that measures 52 Prader-Willi Syndrome specific behaviors on a 3-point scale (0-2), where 0=Not True, and 2=Often True. Higher scores indicate greater severity.	16 weeks

Collaborators and Investigators

• Sponsor: Bright Minds Biosciences Pty Ltd

Study record dates

Study Major Dates

• Study Start (Estimated): January 1, 2026
• Primary Completion (Estimated): November 1, 2026
• Study Completion (Estimated): March 1, 2027

Study Registration Dates

• First Submitted: November 17, 2025
• First Submitted That Met QC Criteria: November 24, 2025
• First Posted (Actual): December 5, 2025

Study Record Updates

• Last Update Posted (Actual): December 5, 2025
• Last Update Submitted That Met QC Criteria: November 24, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Imprinting Disorders; Neurologic Manifestations; Nervous System Diseases; Nutrition Disorders; Genetic Diseases, Inborn; Overnutrition; Neurobehavioral Manifestations; Congenital Abnormalities; Abnormalities, Multiple; Overweight; Intellectual Disability; Obesity; Chromosome Disorders; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Nutritional and Metabolic Diseases; Prader-Willi Syndrome
• Other Study ID Numbers: BMB-101-201

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No