Clinical trial NCT05156047: A Phase 3 Study to Assess the Safety and Efficacy of Pitolisant in Adult Patients With Idiopathic Hypersomnia
Official title: A Double-Blind, Placebo-Controlled, Randomized Withdrawal Study to Evaluate the Safety and Efficacy of Pitolisant in Adult Patients With Idiopathic Hypersomnia
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Idiopathic Hypersomnia
Keywords: pitolisant
histamine
sleepiness
Lead sponsor: Harmony Biosciences Management, Inc.
Sponsor class: INDUSTRY
First posted: 2021-12-14
Enrollment: 214
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Double-blind, randomized withdrawal
Primary purpose: TREATMENT

Brief summary: The primary objective of this study is to evaluate the safety and efficacy of pitolisant compared with placebo in treating excessive daytime sleepiness (EDS) in patients with idiopathic hypersomnia (IH) age ≥18 years.

Key secondary objectives of this study are to assess the impact of pitolisant on:

* Overall symptoms of IH
* Patient impression of overall change in their symptoms of IH
* Investigator assessment of overall disease severity of IH

Other secondary objectives of this study are to assess the impact of pitolisant in patients with IH on:

* Patient impression of overall severity of their EDS
* Functional status and activities of daily living
* Sleep-related impairment
* Sleep inertia
* Cognitive function

Detailed description: This is a double-blind, placebo-controlled, randomized withdrawal study in adult patients (ages ≥18 years) with IH. The study will consist of a Screening Period (up to 28 days), an 8-week Open-Label Phase, and a 4-week Double-Blind Randomized Withdrawal Phase.

The Open-Label Phase of the study will be 8 weeks, which includes a 6-week Dose Optimization Period and a 2-week Stable Dose Period. In the Dose Optimization Period, all patients will be titrated to their optimal dose of open-label pitolisant (17.8 mg or 35.6 mg) based on Investigator assessment of tolerability and efficacy. The 3-week titration period will be followed by 3 weeks of flexible dosing (weeks 4-6) during which patients will continue to receive their optimal dose of 17.8 mg or 35.6 mg open-label pitolisant. Patients taking a strong CYP2D6 inhibitor will be allowed in the study; however, for these patients, the maximum permitted daily dose of pitolisant will be 17.8 mg. Following completion of the 6-week Dose Optimization Period, patients will enter the 2-week Stable Dose Period. During this period, patients will remain at their optimal dose (the same dose they were taking at the end of the Dose Optimization Period \[17.8 mg or 35.6 mg\]) of open-label pitolisant for 2 weeks; dose adjustments are not allowed during the Stable Dose Period. At the end of the Stable Dose Period, patients will be defined as responders or non-responders. Responders will be randomized in a 1:1 ratio to receive blinded study drug (pitolisant or matching placebo) in the Double-Blind Randomized Withdrawal Phase of the study. Non-responders will not be randomized to treatment in the Double-Blind Randomized Withdrawal Phase and will complete two safety follow-up telephone contacts (TCs) at 15 (±3) days and 30 (+3) days after their final dose of open-label pitolisant.

During the Double-Blind Randomized Withdrawal Phase, patients (approximately 64 patients per treatment group) will receive blinded study drug either at the same dose they were taking in the Stable Dose Period (17.8 mg or 35.6 mg pitolisant) or matching placebo. The duration of the Double-Blind Randomized Withdrawal Phase will be 4 weeks (weeks 9-12); dose adjustments are not permitted during this phase of the study. After completion of the Double-Blind Randomized Withdrawal Phase (End-of Treatment \[EOT\] Visit is on Day 84, the last day of blinded treatment), patients will complete two safety follow-up TCs with the site at 15 (±3) days and 30 (+3) days after their final dose of blinded study drug, which will include assessment for AEs and concomitant medication use; alternatively, patients will have the opportunity to enroll in a long-term, open-label safety study under a separate protocol. Patients who opt to enroll into the long-term, open-label study will not complete the 15 day and 30 day follow-up TCs.

Eligibility criteria: Inclusion Criteria:

1. Is able to provide voluntary, written informed consent.
2. Has a current diagnosis of IH per International Classification of Sleep Disorders Third Edition (ICSD 3) criteria.
3. Male or female patient age ≥18 years at the time of Screening.
4. Has an ESS score of ≥12 at Screening and at Baseline (Visit 2).
5. Has a PGI-S score of moderate, severe, or very severe at Screening and at Baseline (Visit 2).
6. For patients being treated for OSA or other hypoventilatory conditions, patients must be compliant as demonstrated by BiPAP/CPAP therapy with 30 days of data showing ≥4 hours of BiPAP/CPAP therapy per night for ≥70% of nights. If not on BiPAP/CPAP therapy, patients being treated for OSA must be compliant as determined by the Investigator with their medical device or oral appliance. Data must be from within 90 days prior to the Screening visit. Patients must agree to maintain compliance with their treatment for OSA throughout the duration of the study.
7. If on a treatment that could affect daytime sleepiness (including but not limited to oxybates, stimulants, modafinil, and armodafinil):

   1. Must be on a stable dose for at least 2 months prior to Screening and agree to continue the stable dose for the duration of the study.
   2. If not on a stable dose for 2 months prior to Screening, washout for 5 half-lives or 14 days, whichever is longer, prior to Day 1 and agree to remain off these treatments until completion of the study.
8. A patient who is a female of child-bearing potential (FCBP) must have a negative serum pregnancy test at the Screening Visit and negative urine pregnancy test at the Baseline Visit (Visit 2) and at the end of the Stable Dose Period (Visit 4) and agree to remain abstinent or use an effective method of non-hormonal contraception to prevent pregnancy for the duration of the study and for 21 days after final dose of study drug.
9. Must have a negative result on urine drug screen at the Screening Visit, Baseline Visit (Visit 2) and at the end of the Stable Dose Period (Visit 4), except for medications that are prescribed by a healthcare provider for medical conditions.
10. In the opinion of the Investigator, the patient is capable of understanding and complying with the protocol and administration of oral study drug.

Exclusion Criteria:

1. Has hypersomnia due to another medical disorder (e.g., narcolepsy).
2. Has an AHI of ≥10 as determined by the most recent sleep study or BiPAP/CPAP device readout.
3. Has a clinically significant hypoventilatory condition as determined by the Investigator.
4. Has a primary diagnosis of a psychiatric illness that is not well controlled.
5. Patients taking antidepressants who have not been on a stable dose of their antidepressant for at least 12 weeks prior to Screening; patients on a stable dose of their antidepressant for at least 12 weeks prior to Screening must agree to continue their stable dose for the duration of the study.
6. Experiences a mean of \<6 hours of sleep per night based on sleep diary during Screening (patients need to record at least 7 nights within a 10-day period in their sleep diary within 14-days prior to the Baseline Visit \[Visit 2\]).
7. Consistently consumes \>600 mg of caffeine per day and is unable/unwilling to reduce caffeine intake to ≤600 mg per day for the duration of the study.
8. Does not agree to discontinue any prohibited medication or substance listed in the protocol.
9. Is currently or has previously used pitolisant.
10. Is currently breastfeeding or planning to breastfeed over the course of the study. Lactating women must agree not to breastfeed for the duration of the study and for 21 days after final dose of study drug.
11. Participation in an interventional research study involving another investigational medication, device, or behavioral treatment within 28 days or within 5 half-lives of the investigational medication (whichever is longer) prior to Screening.
12. Has a diagnosis of ESRD (estimated glomerular filtration rate \[eGFR\] of \<15 mL/minute/1.73 m²) or severe hepatic impairment (Child-Pugh C).
13. Has a diagnosis of moderate or severe renal impairment (eGFR ≥15 to ≤59 mL/minute/1.73 m²) or moderate hepatic impairment (Child-Pugh B) at Screening or at any time during the study.
14. Has a history of long corrected QT interval (QTc) syndrome or corrected QT interval using Fridericia's formula (QTcF) \>450 msec for males or \>470 msec for females (QTcF = QT / 3√ RR) at Screening.
15. Is receiving and is unable to discontinue a medication known to prolong the QT interval.
16. Is receiving a concomitant medication that is known to be a strong CYP3A4 inducer, or a centrally acting histamine 1 (H1) receptor antagonist; patients who undergo a washout of these medications of at least 5 half-lives or one week (whichever is longer) may be enrolled in the study. Use of strong CYP2D6 inhibitors is allowed; however, for these patients the maximum permitted daily dose of pitolisant is 17.8 mg.
17. Is a known CYP2D6 poor metabolizer (PM).
18. Has abnormal laboratory values at Screening that are clinically significant as determined by the Investigator.
19. Has initiated any new or change in allied health therapies or interventions that can interfere with the study outcomes within 28 days prior to Screening and at any time during the study, based on the Investigator's judgment.
20. Has a current or recent (within 1 year) history of a substance use disorder or dependence disorder, including alcohol, tobacco, and caffeine use disorders as defined in the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5).
21. Has planned surgery during the study.
22. Has a significant risk of committing suicide or suicidality based on history; routine psychiatric examination; Investigator's judgment; or an answer of "yes" on any question other than questions 1 to 3 (for the previous month) or "yes" on any question in the suicidal behavior section (for the past year) of the Columbia-Suicide Severity Scale (C-SSRS), Baseline/Screening.
23. Based on the judgment of the Investigator, is unsuitable for the study for any reason, including but not limited to an unstable or uncontrolled medical condition or one that might interfere with the conduct of the study, confound interpretation of study results, pose a health risk to the patient, or compromise the integrity of the study. This exclusion criterion applies not only to entry into the study, but also to continuation in the study, should such an unstable, uncontrolled, or serious medical condition arise.

Primary outcomes:
measure: Excessive Daytime Sleepiness
timeFrame: Week 8 to Week 12
Secondary outcomes:
measure: Symptoms of idiopathic hypersomnia
timeFrame: Week 8 to Week 12
measure: Symptoms of idiopathic hypersomnia
timeFrame: Week 8 to Week 12
measure: Symptoms of idiopathic hypersomnia
timeFrame: Week 8 to Week 12
measure: Symptoms of idiopathic hypersomnia
timeFrame: Week 8 to Week 12
measure: Functional outcomes of sleep
timeFrame: Week 8 to Week 12
measure: Sleep related impairments during wakefulness
timeFrame: Week 8 to Week 12
measure: Sleep inertia
timeFrame: Week 8 to Week 12
measure: Working Memory
timeFrame: Week 8 to Week 12
measure: Attention
timeFrame: Week 8 to Week 12
measure: Psychomotor Function
timeFrame: Week 8 to Week 12
Other outcomes:
Locations:
city: Peoria
country: United States
facility: Phoenix Medical Group
state: Arizona
city: Scottsdale
country: United States
facility: Mayo Clinic
state: Arizona
city: Los Angeles
country: United States
facility: Cedars-Sinai Medical Towers
state: California
city: Los Angeles
country: United States
facility: University of California- Los Angeles
state: California
city: San Ramon
country: United States
facility: Sleep Medicine Specialists of California
state: California
city: Santa Ana
country: United States
facility: SDS Clinical Trials Inc.
state: California
city: Santa Monica
country: United States
facility: Santa Monica Clinical Trials
state: California
city: Boulder
country: United States
facility: Alpine Clinical Research Center
state: Colorado
city: Norwalk
country: United States
facility: Norwalk Hospital Sleep Center
state: Connecticut
city: Brandon
country: United States
facility: Meris Clinical Research
state: Florida
city: Clearwater
country: United States
facility: St. Francis Medical Institute
state: Florida
city: Miami
country: United States
facility: Sleep Medicine Specialists of South Florida, PA
state: Florida
city: Saint Petersburg
country: United States
facility: Pasadena Center For Medical Research, LLC
state: Florida
city: Winter Park
country: United States
facility: Florida Pediatric Research Institute
state: Florida
city: Atlanta
country: United States
facility: Neurotrials Research Inc.
state: Georgia
city: Gainesville
country: United States
facility: The Neurological Center of North GA
state: Georgia
city: Chicago
country: United States
facility: Northwestern University
state: Illinois
city: Glenview
country: United States
facility: NorthShore Uni HealthSys-Glenbrook Hospital
state: Illinois
city: Peoria
country: United States
facility: OSF HealthCare Saint Francis Medical Center
state: Illinois
city: Chevy Chase
country: United States
facility: Helene A. Emsellem MD PC
state: Maryland
city: Boston
country: United States
facility: Boston Children's Hospital
state: Massachusetts
city: Newton
country: United States
facility: Neurocare, INC
state: Massachusetts
city: Novi
country: United States
facility: Henry Ford Health System
state: Michigan
city: Portage
country: United States
facility: Bronson Sleep Health
state: Michigan
city: Sterling Heights
country: United States
facility: Clinical Neurophysiology Services
state: Michigan
city: Edina
country: United States
facility: Minnesota Lung Center
state: Minnesota
city: Woodbury
country: United States
facility: Minnesota Lung Center
state: Minnesota
city: Chesterfield
country: United States
facility: St. Luke's Sleep Medicine and Research Center
state: Missouri
city: Saint Louis
country: United States
facility: Clayton Sleep Institute
state: Missouri
city: North Platte
country: United States
facility: Great Plains Health
state: Nebraska
city: West Long Branch
country: United States
facility: Neurology Specialists of Monmouth County, PA
state: New Jersey
city: New Hyde Park
country: United States
facility: Northwell Health
state: New York
city: Denver
country: United States
facility: Research Carolina Elite LLC
state: North Carolina
city: Durham
country: United States
facility: Duke University School of Medicine
state: North Carolina
city: Gastonia
country: United States
facility: Clinical Research of Gastonia
state: North Carolina
city: Huntersville
country: United States
facility: ARSM Research
state: North Carolina
city: Canton
country: United States
facility: NeuroScience Research Center, LLC
state: Ohio
city: Cincinnati
country: United States
facility: Intrepid Research, LLC
state: Ohio
city: Cleveland
country: United States
facility: Rainbow Babies Children's Hospital
state: Ohio
city: Cleveland
country: United States
facility: Cleveland Clinc
state: Ohio
city: Dublin
country: United States
facility: Ohio Sleep Medicine and Neuroscience Institue
state: Ohio
city: Middleburg
country: United States
facility: North Star Medical Research
state: Ohio
city: Ardmore
country: United States
facility: CardioVoyage
state: Oklahoma
city: Paoli
country: United States
facility: Brian Abaluck, LLC
state: Pennsylvania
city: Willow Grove
country: United States
facility: Abington Neurological Associates
state: Pennsylvania
city: Wyomissing
country: United States
facility: Respiratory Specialists
state: Pennsylvania
city: Charleston
country: United States
facility: Medical University of South Carolina- Institute of Psychiatry
state: South Carolina
city: Columbia
country: United States
facility: Bogan Sleep Consultants
state: South Carolina
city: North Charleston
country: United States
facility: Lowcountry Lung Critical Care
state: South Carolina
city: Chattanooga
country: United States
facility: Advanced Center for Sleep Disorders
state: Tennessee
city: Cordova
country: United States
facility: Neurology Clinic, P.C.
state: Tennessee
city: Austin
country: United States
facility: FutureSearch Trials of Neurology LP
state: Texas
city: Round Rock
country: United States
facility: Central Texas Neurology Consultants, PA
state: Texas
city: Sugar Land
country: United States
facility: Comprehensive Sleep Medicine Associates
state: Texas
city: Tomball
country: United States
facility: Northwest Houston Neurology and Sleep
state: Texas
city: Norfolk
country: United States
facility: Children's Hospital of the King's Daughter
state: Virginia
city: Morgantown
country: United States
facility: West Virginia University - Department of Neurology
state: West Virginia
city: Madison
country: United States
facility: University of Wisconsin-Madison
state: Wisconsin
Study officials:
References: