An Adaptive Phase II/III, Two-Part, Double-Blind, Randomized, Placebo-controlled, Dose-Finding, Multi-center Study of the Safety and Efficacy of NaBen®, as an Add-on Therapy With Clozapine, for Residual Symptoms of Refractory Schizophrenia in Adults

NCT03094429 | Recruiting Phase 2 DMC FDA Drug

• 1 other identifier: SNR-05
• Study Type: interventional
• Target: 287
• Locations: 1 country
• Sites: 1

Brief Summary

This is an adaptive, Phase II/III study in 2 parts (i.e. Part 1 (dose ranging) and Part 2 (Hypothesis testing)). NaBen® is granted Breakthrough Therapy Designation by US FDA as treatment for refractory schizophrenia. Part 1 Objectives: There are two primary objectives for Part 1 of this study:

1. 1.To evaluate, in terms of dose-response, the effectiveness of NaBen® (1000 and 2000 mg/day) compared to Placebo (0 mg/day), when combined with clozapine, in improving the residual symptoms associated with refractory schizophrenia in adults, and; to determine the optimal dose to be used in Part 2 of this study.
2. 2.Sample size re-assessment to evaluate the final sample size needed to proceed with Part 2 of the study The secondary objective of the Part 1 of this study is to evaluate the safety and tolerability of NaBen® (1000 and 2000 mg/day) compared to Placebo (0 mg/day), in combination with clozapine.

Conditions

Refractory Schizophrenia

Outcome Measures

Primary Outcomes (1)

• Mean change from baseline in Positive and Negative Syndrome Scale (PANSS) total score

  Mean change from baseline in Positive and Negative Syndrome Scale (PANSS) total score

  8 weeks after randomized treatment

Secondary Outcomes (9)

• Percent change from baseline in Positive and Negative Syndrome Scale (PANSS) total score

  8 weeks after randomized treatment

• Percentage of subjects with 20% or more reduction from baseline in Positive and Negative Syndrome Scale (PANSS) total score

  8 weeks after randomized treatment

• Percent change in PANSS sub-scales and Marder PANSS factor scores

  8 weeks

• Percent change in Personal and Social Performance (PSP) scale

  8 weeks

• Percent change in Schizophrenia Quality of Life Scale (SQLS)

  8 weeks

Other Outcomes (14)

• Incidence of Treatment-Emergent Adverse Events (TEAE) and incidence of withdrawals from the study due to TEAEs

  8 weeks

• Percent change in Simpson-Angus extrapyramidal side effects Scale (SAS)

  8 weeks

• Percent change in Abnormal Involuntary Movement Scale (AIMS)

  8 weeks

Study Arms (3)

NaBen® - 2000 mg/day

ACTIVE COMPARATOR

Two NaBen® ( 500 mg) will be taken twice daily at a total dose of 2000 mg/day during this study.

Drug: NaBen®

NaBen® - 1000 mg/day

ACTIVE COMPARATOR

One NaBen® (500 mg) and one placebo will be taken twice daily at a total dose of 1000 mg/day during this study.

Drug: NaBen®

Placebo - 0 mg/day

PLACEBO COMPARATOR

The control treatment is placebo.

Other: Placebo

Interventions

NaBen® DRUG

2000 mg/day or 1000 mg/day, twice daily

NaBen® - 1000 mg/day; NaBen® - 2000 mg/day

Placebo OTHER

0 mg total, twice daily

Placebo - 0 mg/day

Eligibility Criteria

• Age: 18 Years - 55 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• Male or female subjects who are between 18 and 55 years of age inclusive
• Subject is capable of providing informed consent and is willing to sign the ICF prior to study Screening and agrees to comply with the study protocol requirements, or the subject has a Legally Authorized Representative (LAR) who can provide consent to be enrolled into the study
• If female and not infertile (defined below), the subject must agree for the duration of the study to use one of the following forms of contraception 1) systemic hormonal treatment 2) an Intrauterine device (IUD) which was implanted at least 2 months prior to screening or 3) "double-barrier" contraception (condom, diaphragm and spermicide are each considered a barrier). Females are considered to be infertile if they are either a) surgically sterile or b) have had spontaneous amenorrhea for at least the last 2 years and at least 2 years after the onset of amenorrhea while not receiving hormone replacement therapy and had a Follicle-Stimulating Hormone (FSH) level greater than 40 mIU/mL and an estradiol level less than 30 pg/mL
• The subject has Physician confirmed DSM-V diagnosis of schizophrenia for the past 2 years based on subject's recorded history and confirmed by psychiatric evaluation and MINI International Neuropsychiatric Interview For Schizophrenia and Psychotic Disorders, version 7.0 (MINI, Version 7.0)
• The subjects should have refractory schizophrenia as defined below (should meet at least two: either a and b; or a and c; or a and b and c):
• Prior non-response to at least 2 antipsychotic drugs of two different chemical classes for at least 4-6 weeks each at doses ≥ 400 mg equivalents of chlorpromazine or 4 mg/day risperidone, AND
• No period of good functioning in previous 2 years; OR,
• Moderate to severe psychopathology (total PANSS score equal or more than 70): including persistent psychotic symptoms, recurrent mood symptoms, repeated suicide attempts or suicidal ideation, uncontrolled aggressive behavior, moderate to severe positive or negative symptoms or moderate-severe cognitive impairment
• The subject has been receiving clozapine for a minimum of 6 months with the dose range of 200-900 mg/day. The dose should have remained unchanged for at least 3 months prior to Screening and not expected to change during the study
• The subject is outpatient, and has been consistently symptomatic without significant fluctuation per the Investigator, with no hospitalization for worsening of schizophrenia within 3 months of the Screening. If the subject is hospitalized during the study for worsening of schizophrenia symptoms the subject will be withdrawn from the study
• The subject has a minimum PANSS total score of 70 at the Screening and Baseline Visits (Visits 1 and 2)
• Without clinically significant abnormalities in physical exam, neurological exam and laboratory assessments (urine/blood routine, biochemical tests and ECG) which would exclude the subject from the study in the opinion of the Investigator. For ALT and AST, clinically significant is defined as above two and a half times the upper limit of normal
• Body Mass Index (BMI) between 17 and 38 inclusive
• Subject has a negative routine urine illicit drug screening test (including heroin, amphetamines (including MDMA/ecstasy), cocaine, cannabis or PCP)
• The subject has a caregiver or some other identified responsible person (e.g., family member, social worker, caseworker, or nurse) as determined by the Investigator and per the local regulations. The identified caregiver should be considered reliable by the Investigator and per the local regulations in providing support to the subject to help ensure compliance with study treatment, study visits and protocol procedures who preferably is also able to provide input helpful for completing study rating scales

You may not qualify if:

• Meets the DSM-V criteria at Screening for intellectual disability, dissociative disorder, bipolar disorder, major depressive disorder, schizoaffective disorder, schizophreniform disorder, autistic disorder, primary substance-induced psychotic disorder, dementia, or any other comorbid mental disorders that in the opinion of the Investigator may interfere with study conduct and results interpretation
• Initiation or dose change of lithium, antidepressant or other mood stabilizers within 16 weeks prior to Screening
• Initiation or dose change of benzodiazepines or sleep medications, or any other psychotropic medications due to worsening of schizophrenia symptoms or medication side effects within four (4) weeks prior to Screening
• The subject has previously received NaBen®
• History of epilepsy, major head trauma, or any neurological illness other than Tourette's syndrome which might impair the subject's cognition or psychiatric functioning per the Investigator's judgment
• History of allergic reaction to sodium benzoate
• Serious medical illnesses such as end-stage renal disease, liver failure or heart failure that, in the opinion of the Investigator, may interfere with the conduct of the study
• Any significant gastrointestinal disorders that, in the opinion of the Investigator, markedly alter the absorption, metabolism or elimination of sodium benzoate
• Any movement disorders with a total score higher than 6 on SAS scale, or more than 2 on any items of the AIMS scale
• Current substance abuse, or history of meeting criteria for moderate or severe substance abuse (including alcohol, but excluding nicotine and caffeine) in the past six (6) months prior to Screening
• Female subjects who are pregnant (as confirmed by serum pregnancy test performed at Screening Visit) or are breast feeding
• History of cancer not in remission for the last three (3) years except for basal cell carcinoma and squamous cell carcinoma
• Participation in a clinical trial within 3 months prior to Screening or more than two clinical trials within 12 months
• Electroconvulsive Therapy (ECT) within 6 months prior to Screening
• The subject started a new non-medication treatment for schizophrenia or other psychiatric condition within the last 3 months prior to Screening (e.g. individual psychotherapy, cognitive behavioral therapy or rehabilitative therapy)

Sponsors & Collaborators

• SyneuRx International (Taiwan) Corp: lead
• Amarex Clinical Research: collaborator

Study Sites (1)

For additional information regarding investigative sites for this trial, contact SyneuRx International Corp.

Pasadena, California, 91101, United States

RECRUITING

MeSH Terms

Conditions

Schizophrenia, Treatment-Resistant

Condition Hierarchy (Ancestors)

Schizophrenia; Schizophrenia Spectrum and Other Psychotic Disorders; Mental Disorders

Central Study Contacts

Yashar Salek, MD

CONTACT

1-301-956-2527; yashars@amarexcro.com

Felicia Yao

CONTACT

886-2-77422699; felicia.yao@syneurx.com

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: November 16, 2015
• First Posted: March 29, 2017
• Study Start: March 29, 2017
• Primary Completion (Estimated): September 30, 2026
• Study Completion (Estimated): December 31, 2026
• Last Updated: September 13, 2021

Record last verified: 2021-09

Locations

US (1)