Histamine Responsiveness in McCune-Albright Syndrome (NCT00318097) | Clinical Trial Compass
CompletedNot Applicable
Histamine Responsiveness in McCune-Albright Syndrome
United States22 participantsStarted 2004-08-01
Plain-language summary
McCune-Albright syndrome (MAS) is a syndrome caused by a genetic mutation that causes a specific protein in the body called a G protein to be constantly active. Children with McCune-Albright syndrome classically have early puberty, areas of increased skin pigmentation, and bone lesions resulting from the constant activity of the specific protein involved.
Histamines are known to play a role in allergies and related allergic problems. The effects of histamines are controlled by the same G protein that is overly active in McCune-Albright syndrome. Thus, one could predict that patients with McCune-Albright may be at high risk for allergic problems. To date, no studies have documented any form of histamine excess or allergic difficulties in patients with McCune-Albright syndrome. However, the investigators have made the observation that a high percentage of their patients with MAS exhibit a range of allergic symptoms, from mild symptoms, to severe, life-threatening symptoms.
The purpose of this study is to demonstrate increased histamine response by using a histamine skin test in patients with MAS. If increased reactions to histamines can be documented in MAS patients when compared to controls, severe and potentially life threatening allergic reactions in children with MAS could be anticipated and avoided.
Who can participate
Age range
39 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Children with MAS ranging from toddlers to young adults.
* Diagnosis of MAS will be made on a clinical basis. Blood testing is not helpful in this condition, as bone marrow progenitor cells with the Gαs mutation display a survival disadvantage. All patients are mixed chimeras, as this mutation is lethal if it occurs in germline cells.
* Patients who exhibit two or more of the following clinical findings fit the diagnosis of MAS:
* GnRH independent precocious puberty
* Polyostotic fibrous dysplasia
* Café-au-lait spots with coast of Maine borders and respect for the midline.
* Non-autoimmune hyperthyroidism.
* Ten controls will also be recruited from family members of patients with MAS with no known allergies. An additional control group of ten unrelated subjects, also with no known allergies, will be recruited from the Endocrine Clinic for comparison.
Exclusion Criteria:
* Any MAS patient or control who has not, or cannot, discontinue(d) any home regimens of antihistamines or glucocorticoids (including inhaled steroids) at least seven days prior to skin testing.
* Any MAS patient or control on tricyclic antidepressants within two weeks prior to skin testing.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.