Tolerability, Safety, and Activity of SRX246 in Irritable Subjects With Huntington's Disease

Phase 2

Completed

Conditions: Irritable Mood
Huntington's Disease

Interventions: Drug: SRX246
Drug: Placebo

Registration Number: NCT02507284

Lead Sponsor: Azevan Pharmaceuticals

Brief Summary: This study evaluates the tolerability, safety and activity of SRX246 in the treatment of irritability in patients with Huntington's disease. Two-thirds of all participants will receive SRX246, while the other third will receive a placebo.

Detailed Description: SRX246 is a first-in-class vasopressin 1a (V1a) receptor antagonist that crosses the blood-brain barrier following oral administration. The molecule exhibits high affinity and high selectivity for its target receptor. Preclinical pharmacology studies have demonstrated significant CNS effects in models of irritability, including impulsive aggression, depression, and anxiety. In an experimental medicine fMRI study in healthy volunteers, SRX246 treatment significantly attenuated the effect of intranasal AVP in brain circuits known to modulate emotional responses to stimuli that elicit aggression/fear. Together, these findings suggest that SRX246 has potential as a novel therapeutic agent for major neuropsychiatric symptoms seen in HD patients.

This is a 3-arm, multicenter, randomized, placebo-controlled, double-blind, 12 week, dose escalation study of SRX246 in irritable Subjects with early symptomatic HD.

Following an initial screening visit, Subjects fulfilling the study inclusion and exclusion criteria will enter a pre-treatment screening phase to permit evaluations to confirm eligibility for inclusion into the study. This screening phase will be no longer than 30 days. At the completion of the screening period, eligible Subjects will be randomized at baseline visit to receive either placebo or final doses of SRX246 of 120 mg twice daily or 160 mg twice daily during the double-blind treatment phase. At baseline, Subjects in the active groups will receive 80 mg twice daily for 2 weeks, then escalate to 120 mg twice daily for 4 weeks. Then one group of Subjects will continue to take 120 mg of SRX246 twice daily for an additional 6 weeks, and the second group of Subjects will increase their dose to 160 mg of SRX246 twice daily for 6 weeks. Total dosing duration is 12 weeks.

Subjects in the placebo group will receive a similar number of capsules that are identical in appearance to the capsules that contain SRX246 during the trial, in order to preserve the blind.

In all groups, dose escalation will occur (stepwise) if patients have not experienced dose-limiting adverse effects. Patients who cannot tolerate their final dose of drug (or placebo) can have this dose reduced without compromising the blinding.

Subjects will have periodic visits either "in-person" or by "telephone", to assess tolerability, safety, and several measures of irritability and other problem behaviors, and clinical assessments for activity signals.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 106

Inclusion Criteria

Male and female Subjects aged 18 years or older
Subjects must have clinical features of HD, which can include motor, cognitive, or behavioral symptoms
A confirmatory family history of HD; OR CAG repeat expansion ≥ 37
Total Functional Capacity (TFC) score of 5-13
Evidence of irritability; a score of at least 2 or greater on the severity measure of either the UHDRS Irritability question (30b) or Aggression question (Disruptive or Aggressive Behavior, 31b)
Women of childbearing potential (i.e., those not postmenopausal or surgically sterile) must have a negative pregnancy test, be non-lactating and use adequate contraception methods during the study. Adequate birth control includes: abstinence; oral, implanted or injected contraceptives, e.g., birth control pills; intra-uterine device; barrier (vaginal ring or diaphragm/cervical cap with spermicide); transdermal patch. Reliable contraception must have been in use 30 days prior to the Baseline Visit. Partner(s) contraception (e.g., male partner with vasectomy or other surgical contraception) is acceptable.
Men must agree not to father a child during the study and one month after and to use contraception. Barrier with spermicide or surgical contraception is acceptable. Partner(s) contraception (e.g., female partner taking birth control pills or surgically sterile) is acceptable.
Subjects must be able to swallow study drug capsules whole.
Sufficient English skills to complete all assessments without assistance of an English language interpreter. Subjects with HD who cannot read or write might qualify for enrollment in the study. Site PIs will have to decide in each case whether the Subject can understand and fully participate with help from his/her Informant.
Availability of a responsible Informant (referred to as a "study partner" in the consent document) who has good English skills, is familiar with the Subject, and is able and willing to comply with all required study procedures, ensuring that the patient attends all study visits and takes the study medicine as instructed. The study partner must spend time with the patient a minimum of 4 times per week on 4 separate days, and must monitor the patient's compliance and adverse events, participate in caregiver assessments, and use the eDiary.
Subject has provided written, informed consent or, if Subject lacks the capacity to provide informed consent (as determined by an independent assessment by a qualified healthcare provider not directly involved in other study activities), a legally authorized representative (LAR) has provided written informed consent and the Subject has provided assent.

Exclusion Criteria

Any significant neurologic disease other than HD at Screening.
Severe psychotic features or other severe psychiatric symptoms within the last three months which could lead to difficulty complying with the protocol.
History of active alcohol or substance abuse within the past two years or Subject is unable to refrain from substance abuse throughout the study.
Any chronic disability, significant systemic illness or unstable medical condition at Screening or Baseline that could lead to difficulty complying with the protocol.
Use of any investigational drugs within 30 days of Screening.
Subject has known allergy to any of the components of study medication.
Subject is currently pregnant, breast-feeding and/or lactating.
Subject acknowledges present use of illicit drugs at Screening.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
SRX246 120mg BID	SRX246	SRX246 capsules, administered orally, in divided doses twice daily
SRX246 160mg BID	SRX246	SRX246 capsules, administered orally, in divided doses twice daily
Placebo	Placebo	Placebo capsules, administered orally, in divided doses twice daily

Primary Outcome Measures

Name	Time	Method
Tolerability of SRX246	12 weeks	The primary endpoint, tolerability of SRX246, was assessed by the number of completers in each group.

Secondary Outcome Measures

Name	Time	Method
Safety of SRX246	12 weeks	The Safety of SRX246 was assessed by the number of participants who experience an adverse event.

Trial Locations

Locations (22): UCLA, Neurology Clinic
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Los Angeles, California, United States
University of Pittsburgh Medical Center, Department of Neurology
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Pittsburgh, Pennsylvania, United States
Northwestern Out-Patient Neurology Clinic
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Chicago, Illinois, United States
Swedish Neuroscience Institute
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Seattle, Washington, United States
University of Miami, Miller School of Medicine, Jackson Behavioral Health Hospital
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Miami, Florida, United States
Vanderbilt Clinical Research Center
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Nashville, Tennessee, United States
University of Rochester Medical Center
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Rochester, New York, United States
Washington University School of Medicine
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Saint Louis, Missouri, United States
UC Davis Medical Center, Department of Neurology, CTSC Clinical Research Center
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Sacramento, California, United States
University of Alabama
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Birmingham, Alabama, United States
University of Colorado Hospital Translational Research Center
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Aurora, Colorado, United States
Emory University
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Atlanta, Georgia, United States
Massachusetts General Hospital
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Charlestown, Massachusetts, United States
SUNY Stony Brook Clinical Research Center, Department of Neurology
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East Setauket, New York, United States
Columbia University Medical Center, New York Presbyterian Hospital
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New York, New York, United States
University Medical Arts Building
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Cincinnati, Ohio, United States
Oregon Health and Science University
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Portland, Oregon, United States
Ohio State University, Wexner Medical Center, Department of Neurology
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Columbus, Ohio, United States
University of Utah, Department of Neurology
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Salt Lake City, Utah, United States
UT Southwestern Medical Center
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Dallas, Texas, United States
University of Virginia Health System, Department of Neurology
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Charlottesville, Virginia, United States
University of Kansas Medical Center
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Kansas City, Kansas, United States