A Study of Glyceryl Tri-(4-phenylbutyrate) (GT4P)

Phase 1

Completed

• Conditions: Healthy
• Interventions: Drug: Ammonul; Drug: HPN-100; Drug: Buphenyl

• Registration Number: NCT00977600
• Lead Sponsor: Amgen

Brief Summary

To determine the safety and tolerability of single oral doses of HPN-100 as a formulation (GT4P-F) and GT4P as the active pharmaceutical ingredient (GT4P-API) administered to healthy male subjects.

Detailed Description

A randomized, open-label, four-treatment, four-period crossover study in which healthy male subjects received a single dose of each of the following four treatments on four separate dosing days, 7 days apart:

* Oral sodium phenylbutyrate (Buphenyl®) equivalent to 3 g/m2 of 4-phenylbutyric acid (PBA) per dose

* Oral GT4P-F mole equivalents to 3 g/m2 of PBA per dose

* Oral GT4P-API mole equivalents to 3 g/m2 of PBA per dose

* Intravenous 10% sodium phenylacetate plus 10% sodium benzoate (Ammonul®) 2.75 g/m2

Study acquired from Horizon in 2024.

Study Timeline

• Study Start: 2005-03
• Study Completion: 2005-07
• Study First Submitted: 2009-09-15
• Study First Submitted QC: 2009-09-15
• Study First Posted: 2009-09-16
• Status Verified: 2024-06
• Last Update Submitted: 2024-06-18
• Last Update Posted: 2024-06-20

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 24

Inclusion Criteria

Subjects were required to fulfill the following criteria in order to participate in the study:

• Males aged 18 to 45 years of age
• Ability to provide written, informed consent before any study-related procedures, and ability, in the opinion of the investigator, to comply with all the requirements of the study
• Subjects who were in good health as determined by a medical history, physical examination, serum chemistry, hematology, urinalysis, 12 lead ECG, and vital signs
• Weight within the range of 60-120 kg

Exclusion Criteria

Subjects who fulfilled any of the following criteria were excluded from the study:

• Clinically significant history or evidence of cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, neurologic, immunologic, or psychiatric disorder(s), as determined by the investigator
• Clinically significant abnormal laboratory values (as determined by the investigator)
• Significant illness within 14 days prior to screening
• Any disorder that might significantly interfere with the absorption, distribution, metabolism, or excretion of any drug
• Use of any prescription medication within 14 days prior to screening
• Use of dietary supplements, herbal medicines, vitamins, or over-the-counter medication(s) (with the exception of acetaminophen ≤ 500 mg/day) within 10 days prior to first dosing
• Positive drugs of abuse urine test at screening or pre-dose day (cocaine, amphetamines, barbiturates, opiates, benzodiazepines, cannabinoids, methadone)
• Positive alcohol breath test at screening or pre-dose day
• Donation or loss of blood (500 ml or more) within 30 days prior to first dosing, or during the study
• Donation or loss of plasma within 7 days prior to first dosing, or during the study
• History of or current hepatitis or carriers of hepatitis B surface antigen (HBsAg) and/or hepatitis C antibodies (anti-HC)
• History of acquired immunodeficiency syndrome (AIDS) or determined HIV positive at screening
• Use of any investigational drug within 12 weeks prior to first dosing
• Known hypersensitivity to sodium phenylbutyrate or similar drugs
• Previous exposure to sodium phenylbutyrate

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Ammonul	Ammonul	Ammonul® was supplied as single-use glass vials of 10% sodium phenylacetate and 10% sodium benzoate for intravenous injection. Ammonul® was diluted before use with sterile dextrose injection 10% to a concentration of 9 mg/ml. Once diluted it was kept at room temperature and used within 24 hours. The dose was 2.75 g/m2 and was administered as an intravenous infusion over a 120-minute period. Ammonul® was stored at 25°C, within a range of 15-30°C.
GT4P-API	HPN-100	GT4P-API was supplied as an odorless, colorless, tasteless oil in 125 ml bottles. The administered dose was calculated to contain the number of moles of PBA equivalent to 3 g/m2 of PBA. GT4P-API was taken orally and washed down with 100 ml of water. GT4P-API was stored at ambient temperature, away from light.
GT4P-F	HPN-100	GT4P-F (80% GT4P) was supplied as an odorless, colorless, tasteless liquid oil in 125 ml bottles. This formulation was designed to be mixed in water and create a self-emulsifying suspension, thus administered in water for the trial. The administered dose was calculated to contain the number of moles of PBA equivalent to 3 g/m2 of PBA. GT4P-F was mixed in 50 ml of water, taken orally, and then the cup rinsed with 50 ml of water and taken orally. GT4P-F was stored at ambient temperature away from light.
Buphenyl	Buphenyl	Sodium phenylbutyrate or Buphenyl® was supplied as a white powder in 250 g bottles. The required amount of powder (equivalent to 3 g/m2 of PBA) was weighed out, mixed in 100 ml of water, and administered orally. Doses were calculated on a weight/volume basis and corrected for sodium content and purity. Buphenyl® was stored at ambient temperature.

Primary Outcome Measures

Name	Time	Method
The rate of adverse events	33 Days

Trial Locations

Locations (1)

Medical Sanitary Division #2; 🇺🇦 Kharkiv, Ukraine