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Retrospective Study of Adult Patients With Inborn Errors of Metabolism in Switzerland

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03534752
Recruitment Status : Completed
First Posted : May 23, 2018
Last Update Posted : July 20, 2021
Information provided by (Responsible Party):
Christel Tran, University of Lausanne

Brief Summary:
This is a retrospective study aimed at establishing a database of the current health of adult patients with IEM in the French-speaking part of Switzerland. .

Condition or disease
Inborn Errors of Metabolism

Detailed Description:

Background Inborn errors of metabolism (IEMs) are a group of rare disorders caused by genetic mutations that affect enzymes of intermediary metabolism. Because adult with IEMs has become an emerging and challenging group in Switzerland, this study is intended to assess the actual situation of adult patients with IEM in the French-speaking part of Switzerland, namely their age, their sex, their diagnosis, age at disease onset and their clinical outcome including complications of the disease.

All adult patients with a biochemical and/or genetic diagnosis of IEM followed at the adult metabolic clinic from the Lausanne University Hospital and Geneva University Hospital between 01.10.2013 to 31.12.2017 will be included in the study. In addition, investigators will also include the patients referred to the clinic for suspicion of IEM and determinate if the investigation confirmed an IEM disease. Electronic and paper patient charts will be reviewed for clinical features, biochemical investigations, molecular genetic testing, diagnostic imaging, treatment and long-term outcome. All data will be entered in an Excel database.

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Study Type : Observational
Actual Enrollment : 220 participants
Observational Model: Cohort
Time Perspective: Retrospective
Official Title: Clinical Characteristics of Adult Patients With Inborn Errors of Metabolism in French-speaking Switzerland
Actual Study Start Date : April 1, 2018
Actual Primary Completion Date : April 1, 2019
Actual Study Completion Date : April 1, 2020

Primary Outcome Measures :
  1. Specific diagnosis of IEM listed by their frequency [ Time Frame: First visit ]
    Clinical outcome

  2. Age at diagnosis (years/months) [ Time Frame: First visit ]
    Clinical outcome

  3. Medical complications [ Time Frame: 4 years ]
    Clinical outcome including acute liver failure, nephropathy, metabolic acidosis, ophthalmologic anomalies, epilepsy, encephalopathy, myopathy, neuropathy, diabetes

  4. Specific treatment for Inborn Errors of Metabolism [ Time Frame: 4 years ]
    Treatment specific to each diseases including ammonia scavenger, enzyme replacement therapy, carnitine, ubiquinone, vitamins, specific diet, dialysis, specific metabolic formula

  5. Number of hospital admission [ Time Frame: 4 years ]
    Clinical outcome

  6. Survival rate (%) [ Time Frame: 4 years ]
    Clinical Outcome

  7. Gender (Male/female) [ Time Frame: First visit ]
    Demography outcome

Secondary Outcome Measures :
  1. Abdominal Ultrasound results [ Time Frame: 4 years ]
    Radiological Imaging description of spleen and/or liver when available (size, echostructure)

  2. Magnetic resonance Imaging scan [ Time Frame: 4 years ]
    Radiological Imaging description of brain, abdomen and bone when available

  3. Bone density test [ Time Frame: 4 years ]
    Radiological Imaging description of bone including T-score when available

  4. Biological biomarkers of specific diseases (lysosomal storage disorders and galactosemia) [ Time Frame: 4 years ]
    Laboratory including blood concentration of chitotriosidase and Galactose-1-Phosphate

  5. Clinical chemistry [ Time Frame: 4 years ]
    Laboratory including blood concentration of sodium, potassium, liver function tests, creatinine, uric acid, urea, amino acids, acylcarnitine profile, methylmalonate, total homocysteine and urine concentration of organic acids

  6. Hematology tests [ Time Frame: 4 years ]
    Laboratory (blood count, international normalized ratio, prothrombin time)

  7. Enzyme activity in leucocytes and/or fibroblasts [ Time Frame: 4 years ]
    Enzyme activity of deficient enzyme when available for lysosomal storage diseases, mucopolysaccharidoses, cobalamin deficiency, diseases, classical homocystinuria

  8. Molecular analysis results of candidate gene for Inborn Errors of metabolism [ Time Frame: 4 years ]
    Laboratory including mutation results confirming the molecular origin of the disease when available

Other Outcome Measures:
  1. Educational level [ Time Frame: 4 years ]
    Demography outcome

  2. Profession [ Time Frame: 4 years ]
    Demography outcome

Information from the National Library of Medicine

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, Learn About Clinical Studies.

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Ages Eligible for Study:   16 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Outpatient clinic for Adult patients with Inborn Errors of Metabolism from the Lausanne University Hospital (Division of Genetic Medicine) and Geneva University Hospital (Division of Endocrinology, Diabetology, Hypertension and Nutrition of the HUG.

Inclusion Criteria:

  • All IEM adult patients who were transitioned from the pediatric clinic to the adult metabolic clinic (the Centre for Molecular Disease in Lausanne and the Division of Endocrinology, Diabetology, Hypertension and Nutrition of the HUG) since its creation in 2013 and those who were referred to our clinic for suspicion of IEM and requiring further investigation.

Exclusion Criteria:

  • Age < 16 years . Any document attesting a refusal to participate will exclude the data entry of the concerned patient.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03534752

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Lausanne University Hospitals
Lausanne, Vaud, Switzerland, 1011
Sponsors and Collaborators
University of Lausanne
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Principal Investigator: Christel Tran, MD Lausanne University Hospital
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Responsible Party: Christel Tran, Principal Investigator, University of Lausanne Identifier: NCT03534752    
Other Study ID Numbers: 2017-02328
First Posted: May 23, 2018    Key Record Dates
Last Update Posted: July 20, 2021
Last Verified: July 2021

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Christel Tran, University of Lausanne:
Inborn errors of Metabolism
Clinical characteristics
Additional relevant MeSH terms:
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Metabolism, Inborn Errors
Genetic Diseases, Inborn
Metabolic Diseases