Erythropoietic Protoporphyrias: Studies of the Natural History, Genotype-Phenotype Correlations, and Psychosocial Impact

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

150 participants

Study Classification

OBSERVATIONAL

Study Start Date

2012-07-31

Study Completion Date

2019-07-01

Brief Summary

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The initial objective of this protocol is to assemble a well-documented group of patients with confirmed diagnoses of the erythropoietic protoporphyrias, including autosomal recessive Erythropoietic Protoporphyria (EPP) and X-Linked Protoporphyria (XLP) for clinical, biochemical, and genetic studies. The long-term objectives are (1) to conduct a longitudinal investigation of the natural history, complications, and therapeutic outcomes in people with erythropoietic protoporphyria, (2) to systematically investigate the psychological effects of the erythropoietic protoporphyrias on children and adults, and (3) to investigate the correlation between the identified genotypes and the resulting clinical presentation, also determining the possible interaction of other genetic markers.

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Detailed Description

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The porphyrias are a group of rare metabolic diseases that may present in childhood or adult life and are due to deficiencies of enzymes in the heme biosynthetic pathway. The most common manifestations are related to accumulation of intermediates in the pathway and usually occur as acute neurological attacks (as in the acute or hepatic porphyrias), or cutaneous photosensitivity (as in the cutaneous porphyrias, including the erythropoietic protoporphyrias). Multiple mutations have been identified in each of the porphyrias. The risk of disability or death from these disorders is significant, in part because diagnosis is often delayed due to lack of adoption of diagnostic testing in clinical practice. Moreover, the natural history of these disorders is not well described and it is not known what determines differences in outcomes. New therapies are needed. For existing therapies, high-quality evidence on short and long term efficacy and safety is generally lacking. Therefore, the purpose of this study of a large group of patients with EPP and XLP is to provide a better understanding of the natural history of these disorders, as affected by available therapies, and to aid in developing new forms of treatment. Much of the data collected on subjects as participants in the Longitudinal Study of the Porphyrias will be accessed for this study specific to the investigation of the erythropoietic protoporphyrias. To maximize the information that can be informative in our objectives, additional data will be collected, including additional biochemical findings and EPP-specific psychosocial parameters.

The Office of Rare Diseases (ORD) of the National Institutes of Health (NIH) established a Rare Diseases Clinical Research Network (RDCRN) in collaboration with other NIH Institutes and currently has funded 19 rare diseases clinical research consortia and one Data Management and Coordinating Center. The Porphyrias Consortium was created as part of the RDCRN, to study the human porphyrias. The Porphyrias Consortium is a consortium of the academic institutions listed in the participating institutions table. All Centers in the Porphyrias Consortium are participating in this study. Additional centers may be added if funding is available.

Conditions

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Erythropoietic Protoporphyria EPP X-Linked Protoporphyria XLP XLPP X-Linked Dominant Erythropoietic Protoporphyria XLEPP XLDP

Study Design

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Observational Model Type

COHORT

Study Time Perspective

OTHER

Study Groups

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Participants with Protoporphyrias

Individuals with a documented diagnosis of Erythropoietic Protoporphyria (EPP) or X-Linked Protoporphyria (XLP)

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

* All subjects must also be enrolled in the Longitudinal Study of the Porphyrias.
* Willing to sign informed consent form
* Biochemical findings - A marked increase in erythrocyte protoporphyrin \[total erythrocyte protoporphyrin \>200 ug/dL, or more than 1.5-fold increase (relative to ULN of 80 ug/dL)\], with a predominance of free protoporphyrin (85-100% in EPP and 50-85% in XLP).
* Molecular findings - one of the following:

1. A disease causing FECH mutation trans to the IVS3-48C\>T low expression FECH allele
2. Two disease-causing FECH mutations
3. A gain-of-function ALAS-2 C-terminal deletion/exon 11 mutation (in XLP). If no mutation is found and subjects fulfill criteria 1-3 they are eligible for enrollment.

Exclusion Criteria

* cases with elevations of porphyrins in urine, plasma or erythrocytes due to other diseases (i.e. secondary porphyrinuria or porphyrinemia), such as liver and bone marrow diseases \[Gibson 2000\].
* patients with a prior diagnosis of porphyria that cannot be documented by review of existing medical records or repeat biochemical or DNA testing.

Eligible Sex

ALL

Accepts Healthy Volunteers

No