Investigation of Hematologic Parameters in Mastocytosis and Idiopathic Anaphylaxis


N/A
N/A
N/A
Not Enrolling
Both
Mastocytosis, Anaphylaxis

Thank you

Trial Information

Investigation of Hematologic Parameters in Mastocytosis and Idiopathic Anaphylaxis


Anaphylaxis is a severe systemic hypersensitivity reaction caused by release of mediators
from mast cells and basophils. Signs and symptoms of anaphylaxis may include generalized
flushing, hives, stuffy nose, red and itchy eyes, difficulty in breathing, swelling of the
tongue, throat, palms and soles, gastrointestinal cramping, lightheadedness and loss of
consciousness. Although most common causes of anaphylaxis include foods, drugs and stinging
insects, a causative factor is not identified in up to 50% of the patients with recurrent
anaphylactic episodes. Mast cells are important mediators of anaphylaxis. This study will
examine the hypothesis that some patients with unexplained anaphylaxis may have systemic
mastocytosis, a disorder of pathologic mast cell proliferation, as an underlying cause. In
addition, it will investigate hematopoietic cells, which result in their tissue mast cells
being more susceptible to degranulation. The study will enroll patients with mastocytosis
with or without flushing or anaphylaxis, and patients with unexplained flushing or
anaphylaxis. Patients will receive a clinical evaluation, blood tests and a bone marrow
biopsy and aspirate. Research studies planned include flow cytometric analysis of blood and
bone marrow cells, investigation of mutations or polymorphisms in genes involved in mast
cell growth and differentiation, determination of surrogate disease markers and examination
of mast cell growth and function. The study will improve the understanding of the
mechanisms involved in anaphylactic reactions, which could in turn lead to development of
strategies to better prevent or treat the episodes.

Inclusion Criteria


INCLUSION CRITERIA FOR PATIENTS WITH MASTOCYTOSIS:

Age equal to or greater than 18 years.

Diagnosis of mastocytosis established by presence of typical urticaria pigmentosa skin
lesions or a bone marrow biopsy.

Letter of referral from prospective study participant's local doctor.

Ability to give informed consent.

EXCLUSION CRITERIA FOR PATIENTS WITH MASTOCYTOSIS:

Age less than 18 years.

Lack of a referral physician.

Presence of co-morbid conditions which, in the judgment of the investigator or the
referring physician, may put the patient at undue risk for travel (such as an acute
infection, severe thrombocytopenia).

Inability to provide informed consent.

Inability or refusal to undergo a bone marrow biopsy and aspirate.

Known allergy to latex or Lidocaine.

INCLUSION CRITERIA FOR PATIENTS WITH UNEXPLAINED FLUSHING OR ANAPHYLAXIS:

Age equal to or greater than 18 years.

Presence of flushing or anaphylaxis with negative workup for known causes such as
carcinoid syndrome, pheochromocytoma, food allergy.

Ability to give informed consent.

EXCLUSION CRITERIA FOR PATIENTS WITH UNEXPLAINED FLUSHING OR ANAPHYLAXIS:

Same as for patients with mastocytosis.

Known cause for anaphylaxis or flushing.

Frequent life-threatening anaphylactic episodes: History of 6 or more separate attacks
resulting in ER visits in the 6 months preceding the referral.

INCLUSION CRITERIA FOR RELATIVE:

To have a first-degree relative accepted to the protocol as a patient with unexplained
anaphylaxis, flushing or mastocytosis.

Ability to give informed consent. For minors, ability of the parent to give informed
consent.

There are no age restrictions.

Type of Study:

Observational

Study Design:

N/A

Authority:

United States: Federal Government

Study ID:

030010

NCT ID:

NCT00047918

Start Date:

October 2002

Completion Date:

August 2004

Related Keywords:

  • Mastocytosis
  • Anaphylaxis
  • Mast Cells
  • Bone Marrow
  • Flushing
  • Mutations
  • Mastocytosis
  • Anaphylaxis
  • Anaphylaxis
  • Mastocytosis
  • Urticaria Pigmentosa
  • Mastocytoma

Name

Location
National Institute of Allergy and Infectious Diseases (NIAID) Bethesda, Maryland  20892