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Phase III Study of L-Cysteine in Patients With Erythropoietic Protoporphyria

The recruitment status of this study is unknown because the information has not been verified recently.
Verified April 2000 by FDA Office of Orphan Products Development.
Recruitment status was  Active, not recruiting
Brigham and Women's Hospital
Information provided by:
FDA Office of Orphan Products Development Identifier:
First received: February 24, 2000
Last updated: June 23, 2005
Last verified: April 2000


I. Determine the long-term efficacy and safety of L-cysteine in the prevention photosensitivity in patients with erythropoietic protoporphyria.

Condition Intervention Phase
Erythropoietic Protoporphyria
Drug: cysteine hydrochloride
Phase 3

Study Type: Interventional
Study Design: Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by FDA Office of Orphan Products Development:

Estimated Enrollment: 50
Study Start Date: May 1996
Estimated Study Completion Date: May 1996
Detailed Description:

PROTOCOL OUTLINE: This is a phase III study, lasting 3 years; 1996-1999. Patients are administered L-cysteine orally twice daily, 2 capsules with breakfast and 2 with lunch.

Patients fill in questionnaires and diary sheets about their reaction to sunlight exposure, and have blood tested 3 times a year.


Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No


--Disease Characteristics--

Erythropoietic protoporphyria RBC protoporphyrin greater than 50 micrograms/100 dL

--Prior/Concurrent Therapy--

At least 3 months since prior betacarotene or L-cysteine

No concurrent betacarotene

--Patient Characteristics--

  • Fertile female patients must use effective contraception for duration of trial and for 3 weeks thereafter
  • Not pregnant or nursing
  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: NCT00004940

Sponsors and Collaborators
Brigham and Women's Hospital
Study Chair: Micheline Mary Mathews-Roth Brigham and Women's Hospital
  More Information

No publications provided Identifier: NCT00004940     History of Changes
Other Study ID Numbers: 199/13376, BWH-FDR000996-DR
Study First Received: February 24, 2000
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Keywords provided by FDA Office of Orphan Products Development:
erythropoietic protoporphyria
inborn errors of metabolism
rare disease

Additional relevant MeSH terms:
Protoporphyria, Erythropoietic
Digestive System Diseases
Genetic Diseases, Inborn
Liver Diseases
Metabolic Diseases
Metabolism, Inborn Errors
Porphyrias, Hepatic
Skin Diseases
Skin Diseases, Genetic
Skin Diseases, Metabolic processed this record on November 27, 2014