Study of the Pathogenesis of Porphyria Cutanea Tarda

NCT ID: NCT00005103

Last Updated: 2005-06-24

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 120 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2000-11-30

Brief Summary

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.

Detailed Description

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.

Conditions

Porphyria Cutanea Tarda

Keywords

inborn errors of metabolism; porphyria; porphyria cutanea tarda; rare disease

Eligibility Criteria

Inclusion Criteria

• Well documented sporadic (Type I) or familial (Type II) porphyria cutanea tarda: Increased plasma porphyrins (fluorescence maximum at neutral pH near 617 nm) Increased urinary porphyrins (consisting mostly of uroporphyrin and heptacarboxylporphyrin) Increased isocoproporphyrins in feces
• No other type of porphyria

• Minimum Eligible Age: 0 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

University of Texas

OTHER

Sponsor Role: collaborator

National Center for Research Resources (NCRR)

NIH

Sponsor Role: lead

Principal Investigators

Karl Elmo Anderson

Role: STUDY_CHAIR

University of Texas

Locations

University of Texas Medical Branch

Galveston, Texas, United States

Countries

United States

Other Identifiers

UTMB-433

Identifier Type: -

Identifier Source: secondary_id

UTMB-95-173

Identifier Type: -

Identifier Source: secondary_id

199/14875

Identifier Type: -

Identifier Source: org_study_id