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Cause and Natural Course of Pediatric-Onset Mastocytosis

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: NCT00050193
Recruitment Status : Completed
First Posted : November 26, 2002
Last Update Posted : December 17, 2019
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will evaluate children with mastocytosis, a disease of excessive mast cells in tissues such as skin and bone marrow, to identify the cause of the disease and describe its course. Mast cells can release chemicals that cause itching, blisters, flushing, bone pain, and abdominal pain. Usually, mastocytosis in children involves the skin only and is of limited duration. This study, however, will focus on children with more severe disease that more closely resembles adult-onset mastocytosis.

Patients up to 21 years of age with childhood-onset mastocytosis may be eligible for this study. Candidates must have one or more of the following abnormalities, which indicate severe disease: enlarged liver or spleen; diffuse skin involvement; history of gastrointestinal bleeding or peptic ulcer; bone marrow biopsy with abnormal mast cells either in number or shape; elevated blood levels of the enzyme tryptase; or abnormal hemoglobin, white blood cells, platelets, or clotting factors.

Participants will have a medical history and physical examination; various blood tests, including studies to identify genetic changes that are important in the growth, development, and functioning of human mast cells; and bone marrow aspiration and biopsy. For the bone marrow procedure, the skin over the hipbone and the outer surface of the bone itself are numbed with an injection of local anesthesia. Then, a special needle is inserted into the hipbone and about 2 tablespoons of bone marrow are drawn into a syringe. Another needle is then inserted through the first needle to collect a small piece of the bone marrow. Pain will be managed according to the individual patient s needs. Additional procedures, such as a gastroenterology consultation, colonoscopy to examine the colon, or computerized axial tomography (CT) or ultrasound of the abdomen to assess the liver and spleen, may be done if medically indicated. Standard medical treatment, including antihistamines for itching or steroids for abdominal cramping or diarrhea, will be recommended as appropriate.

Patients biologic parents may also be enrolled to provide a blood sample for genetic analysis and a bone marrow aspirate and biopsy for clinical and research purposes.

Patients will return to NIH once a year for follow-up evaluations until their disease is stable or until the 5-year study ends.


Condition or disease

Detailed Description:

Mastocytosis in infants and children is an unusual disease characterized by an excess of mast cells in tissues. In pediatric onset mastocytosis, disease is usually localized to the skin and disease is considered to be of limited duration. However, a subset of children appear to develop a clinical picture resembling that observed in adults who have adult-onset disease. This study will focus on children with more severe mastocytosis in an attempt to define its pathogenesis, focusing on mutations and polymorphisms in genes regulating mast cell proliferation and survival to determine if they might contribute to this disease pattern. If severe pediatric-onset disease does not fit within the existing classification, new criteria of diagnosis must be proposed for the pediatric age group.

This study will examine children and young adults age birth to 21 years with pediatric-onset disease previously enrolled on NIAID mastocytosis protocols, or as a result of physician referral, which have disease more consistent with adult-onset disease or parameters associated with increased morbidity. The evaluation may include serum tryptase, blood count, bone marrow biopsy and aspirate, morphology and mutational analysis. Subjects may be asked to return in 12-24 months for assessment. If relevant mutation effecting mast cell growth and function are identified, such mutations will be sought in the biologic parents as appropriate, but only when such mutations are believed to be germ line (not somatic) mutations. This study will aid in the understanding of the characteristics of severe mastocytosis in the pediatric age group.

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Study Type : Observational
Actual Enrollment : 103 participants
Official Title: Determining the Pathogenesis of Systemic Pediatric-Onset Mastocytosis
Study Start Date : November 22, 2002
Study Completion Date : March 10, 2014

Resource links provided by the National Library of Medicine

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:   up to 21 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Children with tissue-diagnosed pediatric-onset mastocytosis formerly enrolled in protocols 90-I-0120, and 93-I-0136 or per physician referral with more severe disease as indicated by one of the following parameters:

  • Hepatomegaly or splenomegaly;
  • Diffuse cutaneous mastocytosis;
  • History of gastrointestinal bleeding or peptic ulcer disease;
  • Bone marrow biopsy with abnormal numbers or shaped mast cells or abnormal flow cytometry;
  • Serum tryptase greater than 20ng/ml;
  • Hematologic abnormalities such as an increase WBC, thrombocytosis, and/or an increase in PT and/or PTT.


  • Age birth to 21.0 years of age at the time of entry into the protocol
  • Diagnosis of mastocytosis by skin examination or histologic evidence in a skin or bone marrow biopsy
  • Subject has a primary medical care provider outside the NIH
  • Subject or parent or guardian is able to give informed consent


  • A biological relative with or without the diagnosis of mastocytosis by skin examination or histologic evidence in a skin or bone marrow biopsy
  • Subject has a primary medical care provider outside the NIH


  • Age greater than or equal to 21.0 years
  • No primary care physician
  • Has AIDS or is HIV Positive

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): NCT00050193

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United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
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Principal Investigator: Melody C Carter, M.D. National Institute of Allergy and Infectious Diseases (NIAID)
Layout table for additonal information Identifier: NCT00050193    
Other Study ID Numbers: 030041
First Posted: November 26, 2002    Key Record Dates
Last Update Posted: December 17, 2019
Last Verified: March 10, 2014
Keywords provided by National Institutes of Health Clinical Center (CC):
Mast Cells
Urticaria Pigmentosa
Bone Marrow
Pediatric Mastocytosis
Additional relevant MeSH terms:
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Neoplasms, Connective Tissue
Neoplasms, Connective and Soft Tissue
Neoplasms by Histologic Type
Skin Diseases
Immune Complex Diseases
Immune System Diseases