Study to Collect Data on Fabry Disease Patients With Enhanceable Alpha-Galactosidase A Activity

Completed

Conditions studied: Fabry Disease

In brief

This study will collect data needed to design a treatment trial for patients with Fabry disease using the experimental drug AT-1001. Fabry disease is an inherited metabolic disorder in which an enzyme called alpha-galactosidase A, which normally breaks down fatty substances called glycolipids, is missing or does not function properly. As a result, glycolipids accumulate in various tissues, causing liver, kidney, nerves, skin, muscle and blood vessel problems. No treatment is given in this survey study. Males 18 years of age and older with Fabry disease who have certain genetic mutations associated with enhancement of alpha-galactosidase A activity may be eligible for this study. Participants undergo the following tests and procedures over 5 days: Day 1 Medical history and physical examination, blood tests, electrocardiogram (EKG), routine urinalysis, measurements of height, weight, and vital signs (blood pressure, heart rate, breathing rate, and temperature). Day 2 Blood tests, 24-hour urine collection, vital signs and sweat test. The sweat test (also called QSART, or quantitative sudomotor axon reflex test) measures the amount of sweat in a particular area of skin. A small amount of medication called acetylcholine is put on an area of the skin and a small electric current is applied to stimulate the sweat glands. Day 3 Blood tests, 24-hour urine collection, vital signs, and skin biopsy. For the skin biopsy, a small area of skin is numbed and a punch device is used to remove a 3-mm (1/8-inch) layer of skin for microscopic examination. Day 4 Blood tests, 24-hour urine collection, vital signs, and QSART. Day 5 Blood tests and vital signs. In addition to the above, patients are scheduled at some point in the 5-day study for an eye examination, brain magnetic resonance angiogram (MRA), and a heart examination and echocardiogram. MRA uses a strong magnetic field and radio waves to provide images of the blood vessels in the head and neck. It can detect abnormalities such as aneurysms, vessel malformations, and thickening of the vessel walls. An echocardiogram is an ultrasound test that shows how well the heart pumps blood and if there is thickening of the heart muscle. Patients who are taking enzyme replacement therapy discontinue treatment for up to 6 weeks (no more than two missed infusions) to allow accurate measurement of the amount of alpha-galactosidase A the patient's body produces by itself. They provide weekly blood samples between the time they stop treatment and enter the study. The samples are used to monitor the removal of the enzyme from the body and the possible buildup of Gb(3) in the blood.

Key facts

Study ID

NCT00106912

Run by

National Institute of Neurological Disorders and Stroke (NINDS)

People needed

35

Starts

2005-03-28

Expected to finish

2008-03-27

Last updated by the study team

2017-07-02

Who can join

Age: 18 and older. Sex: male. Healthy volunteers: not accepted.

You may not qualify if…

• Patients whose general health prevents them from participating.
• Patients with significant disease unrelated to Fabry disease (e.g. diabetes, cancer).
• Patients who refuse to sign the informed consent form or who are unable to travel to the NIH Clinical Center.
• Patients who are currently participating in a clinical trial of small molecule or gene therapy for Fabry disease.
• Patients who are currently participating in a clinical trial for any condition other than Fabry disease.
• Patients who are judged by the Principal Investigator to be not qualified to participate.

Where it is running

• National Institutes of Health Clinical Center, 9000 Rockville Pike — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

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