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Study of Treatment and Metabolism in Patients With Urea Cycle Disorders

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00004307
Recruitment Status : Unknown
Verified December 2003 by National Center for Research Resources (NCRR).
Recruitment status was:  Recruiting
First Posted : October 19, 1999
Last Update Posted : June 24, 2005
Information provided by:

October 18, 1999
October 19, 1999
June 24, 2005
December 1999
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No Changes Posted
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Study of Treatment and Metabolism in Patients With Urea Cycle Disorders
Therapeutic and Metabolic Studies of Urea Cycle Disorders: Part A: Nitrogen Flux and Ureagenesis; Part B (Closed): Phase I Adenovirus Vector-Mediated Gene Therapy for Ornithine Transcarbamylase Deficiency

RATIONALE: The urea cycle is the process in which nitrogen is removed from the blood and converted into urea, a waste product found in urine . Urea cycle disorders are inherited disorders caused by the lack of an enzyme that removes ammonia from the bloodstream. Gene therapy is treatment given to change a gene so that it functions normally. Studying the treatment and metabolism of patients with urea cycle disorders may be helpful in developing new treatments for these disorders.

PURPOSE: Two-part clinical trial to study the treatment and metabolism of patients who have urea cycle disorders.

PROTOCOL OUTLINE: This protocol involves 2 clinical studies. Part A is a metabolic study of glutamine conversion to urea at different levels of protein intake, while on and off medications. Part B is a dose escalation study of a first-generation adenoviral vector with an E1 deletion and an E3 deletion substitution (d1309) expressing ornithine transcarbamylase (OTC).

In Part A, diet is controlled for protein and calories. Intravenous glutamine and urea are administered. Controls are given intravenous arginine, phenylacetate, and benzoate.

In Part B, groups of 3 patients are given a single low, intermediate, or high dose of intravenous OTC vector. Allopurinol is administered every 12 hours for 12 days. As of 12/10/1999, Part B of the study is closed.

Phase 1
Primary Purpose: Treatment
Amino Acid Metabolism, Inborn Errors
  • Behavioral: Protein and calorie controlled diet
  • Genetic: Ornithine transcarbamylase vector
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
Unknown status
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Part A. Patients at least 6 months old with ornithine transcarbamylase deficiency (OTC), i.e.: Hemizygous OTC or homozygous autosomal recessive disorder with evidence of complete enzyme deficiency Hemizygous OTC male with late presentation and presumed evidence for residual enzyme activity OTC heterozygotes (molecular diagnosis) with severely symptomatic to asymptomatic disease Obligate heterozygotes for autosomal recessive disorder (parent or genotyped sibling) Normal adult volunteers and genotyped siblings entered as controls Part B. Metabolically stable heterozygous OTC females aged 18 to under 65 Orotic acid level at least 5 times normal on allopurinol Symptoms ranging from severe to asymptomatic acceptable No prior hospitalization for hyperammonemia Exclusion criteria (Parts A and B): Acute or chronic intercurrent illness Pregnancy Acute hyperammonemia

Sexes Eligible for Study: All
6 Months to 64 Years   (Child, Adult)
Contact information is only displayed when the study is recruiting subjects
United States
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National Center for Research Resources (NCRR)
Baylor College of Medicine
Study Chair: Brendan Lee Baylor College of Medicine
National Center for Research Resources (NCRR)
December 2003

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP