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Use of Cysteamine in the Treatment of Cystinosis

This study is currently recruiting participants. (see Contacts and Locations)
Verified December 2, 2016 by National Institutes of Health Clinical Center (CC)
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Human Genome Research Institute (NHGRI) ) Identifier:
First received: August 1, 2006
Last updated: May 12, 2017
Last verified: December 2, 2016

Cystinosis is an inherited disease resulting in poor growth and kidney failure. There is no known cure for cystinosis, although kidney transplantation may help the renal failure and prolong survival. Both the kidney damage and growth failure are thought to be due to the accumulation of the amino acid cystine within the cells of the body. The cystine storage later damages other organs besides the kidneys, including the thyroid gland, pancreas, eyes, and muscle.

The drug cysteamine (Cystagon) is an oral medication given to patients with cystinosis prior to kidney transplantation. The drug works by reducing the level of cystine in the white blood cells and muscle tissue. The drug may also decrease levels of cystine in the kidneys and other tissues.

This study has several goals:

  1. <TAB>Long-term surveillance of cysteamine (Cystagon) treated patients.
  2. <TAB>Detection of new non-kidney complications of cystinosis.
  3. <TAB>Maintenance of a patient population for genetic testing (mutational analysis) of the cystinosis gene.<TAB>

Condition Intervention Phase
Drug: Cysteamine
Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Treatment
Official Title: Natural History Study of the Use of Cysteamine in the Treatment of Cystinosis

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Survival [ Time Frame: Lifetime ]

Secondary Outcome Measures:
  • Renal function, secondary complications of disease [ Time Frame: Decades ]

Estimated Enrollment: 300
Study Start Date: July 6, 1978
Estimated Study Completion Date: December 1, 2018
Estimated Primary Completion Date: December 1, 2018 (Final data collection date for primary outcome measure)
Intervention Details:
    Drug: Cysteamine
    Cystine-depleting agent
Detailed Description:
Patients with nephropathic cystinosis have been treated with the cystine-depleting agent cysteamine since 1978. This therapy prevents or delays renal deterioration, improves growth, and depletes parenchymal tissues of cystine. Based largely upon data produced through this protocol, the Food and Drug Administration approved cysteamine bitartrate for use in cystinosis patients on August 15, 1994. Cysteamine is available as CystagonR through Mylan Pharmaceuticals in 50 mg and 150 mg capsules and as ProcysbiR in 75 mg capsules. By virtue of the current protocol, patients are admitted to the NIH Clinical Center for investigations every two years, except for cases of great interest or urgency. On each 1-3 day admission, a battery of tests is performed and the adequacy of cystine depletion by cysteamine is monitored. This protocol demonstrates the course of cystinosis patients treated with cysteamine, describes new complications of the disorder in poorly treated adults, and maintains NHGRI expertise in the field. Its monitoring and followup of patients over the course of 3 decades represents an invaluable contribution to our understanding of the natural history of this rare disease.

Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Diagnosis of cystinosis, whether classical or one of the variants with later onset or no renal complications.

Patients will be diagnosed as having cystinosis based upon a leucocyte cystine content greater than 1 nmol half-cystine/mg protein (normal, less than 0.2) and a typical clinical course.


Inability to travel to the NIH.

Age less than one week.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00359684

Contact: William A Gahl, M.D. (301) 402-2739

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010   
Sponsors and Collaborators
National Human Genome Research Institute (NHGRI)
Principal Investigator: William A Gahl, M.D. National Human Genome Research Institute (NHGRI)
  More Information

Additional Information:
Responsible Party: National Human Genome Research Institute (NHGRI) Identifier: NCT00359684     History of Changes
Other Study ID Numbers: 780093
Study First Received: August 1, 2006
Last Updated: May 12, 2017

Keywords provided by National Institutes of Health Clinical Center (CC):
Lysomal Storage Disease
Mutation Analysis
Metabolic Disease

Additional relevant MeSH terms:
Lysosomal Storage Diseases
Metabolism, Inborn Errors
Genetic Diseases, Inborn
Metabolic Diseases
Cystine Depleting Agents
Molecular Mechanisms of Pharmacological Action processed this record on May 22, 2017