Clinical Studies

6709: Longitudinal Follow-up of Individuals with Infantile Pompe Disease

Status: Recruiting

Study Summary

Please Note: The Rare Diseases Clinical Research Network will make every effort to enroll all the patients we can, but we cannot make any guarantees that we will be able to enroll everyone in a particular study who wants to participate.

About this Study

This is a longitudinal natural history study of Infantile Pompe disease. We will regularly collect and review medical information regarding the diagnosis of Pompe disease, health information and response to ERT for up to 3 years.

Background

Infantile-onset Pompe disease is an inherited disorder that is normally diagnosed within the first months of life. It is caused by lack of or defect in an enzyme (a special protein that carries out normal chemical reactions within the body) called acid alpha-glucosidase (GAA).  GAA normally breaks down glycogen (stored sugar) in lysosomes (the part of the cell that digests food and other chemicals). Pompe disease is one of many lysosomal storage diseases (LSDs). LSDs are diseases caused by the malfunction of the lysosome or one of their digestive enzymes. Patients with Pompe disease cannot break down lysosomal glycogen. This causes glycogen to build up and damage cells throughout the body, especially in the heart and muscles.

Current treatment for Pompe disease involves enzyme replacement therapy (ERT). In this treatment, the drug alglucosidase alfa (Myozyme) is put into your blood. The drug provides a form of the GAA enzyme to replace the enzyme that is missing or not working properly in the patient’s blood. This treatment has allowed babies to live longer and achieve developmental milestones.

In this study, researchers will learn about the patient’s ability to tolerate ERT. Cross-Reactive Immunological Material (CRIM) is a measurement of natural GAA production. A patient’s CRIM status (either positive or negative) is an important factor that affects how he or she responds to ERT with Myozyme. Children who produce some natural GAA are classified as CRIM+, while children who do not produce any natural GAA are classified as CRIM-.

Children who are CRIM+ generally tolerate ERT well. But, children who are CRIM-, and some children classified as CRIM+, have a poor response to ERT. Patients who have a poor response to ERT have complications because their body sees Myozyme as “foreign” and triggers an immune response to try to remove it from the body. Treatments are currently being developed to stop this immune response and prevent complications from ERT.

We will enroll patients with Infantile Pompe disease in this longitudinal natural history (observational) study. The specific aims of this study are:

  1. To understand the developing natural history of Pompe disease, in both treated and untreated patients;
  2. To evaluate the success of immunosuppressive therapy for CRIM- patients and CRIM+ patients who are risk for complications of ER

Targeted Enrollment

To be eligible to participate, you must:

  • Be an individual of any age diagnosed with one of the following conditions

    • Aspartylglucosaminuria
    • Fucosidosis
    • Galactosialidosis
    • alpha-mannosidosis
    • beta-mannosidosis
    • Mucolipidosis II
    • Mucolipidosis III
    • Schindler disease
    • Sialidosis

You are not eligible to participate if:

  • You are not diagnosed with one of the nine glycoproteinoses listed above.

How to participate

In order to participate in a study, you must personally contact the study coordinator of any of the participating institutions by phone or by e-mail. Please use the information below to inquire about participation.

Join the Contact Registry for: