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Sponsors and Collaborators: |
National Center for Research Resources (NCRR) University of Texas |
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Information provided by: | National Center for Research Resources (NCRR) |
ClinicalTrials.gov Identifier: | NCT00005103 |
OBJECTIVES: I. Determine the effect of standard treatments on various predisposing factors in patients with porphyria cutanea tarda (PCT).
II. Investigate alcohol history, smoking, liver dysfunction and its etiology, estrogen use, and family history of PCT in these patients.
III. Study the relationships of excess iron and the hemochromatosis gene to PCT, including clinical features and risk of recurrence in these patients. IV. Assess hepatitis C virus infections in these patients. V. Assess vitamin C levels in these patients before and after treatment. VI. Assess dietary habits in these patients. VII. Assess activity of cytochrome P450 enzymes (CYP) in vivo in these patients.
VIII. Study polymorphic genes for enzymes that metabolize foreign chemicals, including CYP enzymes and glutathione transferases in these patients.
Condition |
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Porphyria Cutanea Tarda |
Study Type: | Observational |
Study Design: | Screening |
Estimated Enrollment: | 120 |
Study Start Date: | November 2000 |
PROTOCOL OUTLINE: Patients undergo a complete medical evaluation and documentation of porphyria cutanea tarda (PCT) including history, physical examination, standard clinical laboratory tests and porphyrin studies. Alcohol history, smoking, liver dysfunction and its etiology, estrogen use, and family history of PCT are investigated and recorded. Patients complete a questionnaire to assess intake of vitamin C and other nutrients.
Iron status is assessed by serum ferritin, Fe and Fe binding capacity, and by the number of phlebotomies needed to reduce ferritin to the target level. A blood sample is tested for the hemochromatosis (HC) gene to determine whether each patient has 0, 1, or 2 copies of the HC mutation.
Serum hepatitis C virus (HCV) antibody and HCV RNA are measured. Standard liver function tests and liver biopsy are done if clinically indicated. A fasting blood level of ascorbic acid is obtained. Blood clearance of caffeine and antipyrine, and urinary excretion of caffeine and chlorzoxazone metabolites are determined by breath tests or measurements in blood or saliva. Genotyping for polymorphic genes for enzymes that metabolize foreign chemicals, including cytochrome P450 enzymes (CYP) and glutathione transferases are completed. Following completion of the above studies, patients undergo individualized standard treatment either by serial phlebotomies or low dose chloroquine. Patients with HCV are also treated with interferon alfa-2b. Patients are followed after treatment, at which time initial studies are repeated.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Study ID Numbers: | 199/14875, UTMB-433, UTMB-95-173 |
Study First Received: | April 6, 2000 |
Last Updated: | June 23, 2005 |
ClinicalTrials.gov Identifier: | NCT00005103 History of Changes |
Health Authority: | United States: Federal Government |
inborn errors of metabolism porphyria porphyria cutanea tarda rare disease |
Liver Diseases Metabolic Diseases Porphyrias Skin Diseases Rare Diseases Porphyria, Congenital Erythropoietic Metabolism, Inborn Errors Digestive System Diseases |
Genetic Diseases, Inborn Porphyrias, Hepatic Porphyria, Erythropoietic Porphyria Metabolic Disorder Porphyria Cutanea Tarda Skin Diseases, Genetic |
Metabolism, Inborn Errors Liver Diseases Digestive System Diseases Metabolic Diseases Skin Diseases Genetic Diseases, Inborn |
Porphyrias Skin Diseases, Metabolic Porphyrias, Hepatic Porphyria, Erythropoietic Skin Diseases, Genetic Porphyria Cutanea Tarda |