Clinical trial Recruiting at 1 site Observational Ages 6 Months to 99

Examining the genetic factors behind severe combined immunodeficiency

Official title: The Determination of Genetic Basis Of Immunodeficiency

Run by National Institutes of Health Clinical Center (CC) · NCT00055172 · Data updated 2026-11-12

This study is trying to find out how genetics affects severe combined immunodeficiency by looking at blood samples from patients and their family members.

Quick facts

Study typeObservational
Ages6 Months to 99 Years
SexAll
Enrollment100 (estimated)
SponsorNational Institutes of Health Clinical Center (CC)
NIH
Locations1 site (Bethesda, Maryland)
StatusRecruiting
StartedApril 5, 2004
Registry record updatedNovember 10, 2026
Trial IDNCT00055172 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include patients aged 6 months and older with diminished immune cell counts or function, as well as their relatives.

Probably not a fit

Patients with a known diagnosis of immunodeficiency or those with specific immunological phenotypes not relevant to the study may not benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to investigate the hereditary factors contributing to various forms of severe combined immunodeficiency (SCID). It focuses on the role of specific cytokines and their receptors in immune function. Blood samples will be collected from participants for genetic analysis to better understand the genetic basis of inherited immunodeficiencies. Both patients with immune deficiencies and their relatives will be included in the study.

Why it matters

Potential benefit: If successful, this study could lead to improved understanding and potential treatments for severe combined immunodeficiency.

How similar studies have gone: Other studies have shown success in identifying genetic factors in immunodeficiencies, making this approach promising.

Who can join: the full rules

Show full inclusion / exclusion criteria
* INCLUSION CRITERIA:

Index cases to be included are those with diminished numbers of T cells and/or NK cells and/or B cells or other immune cells or those who have normal numbers of T cell, B cells, NK cells and other immune cells but diminished function of one or more immune cells. Relatives of affected individuals may also be studied

* Patients (index cases): 6 months of age and older
* Siblings: 6 months of age and older
* Non-sibling relatives (biological parent, aunt, uncle or grandparent): 18 years or older

EXCLUSION CRITERIA:

* Patients with a known diagnosis
* Patients with a particular immunological phenotype that is not of interest to the research conducted under this study.
* Pregnancy or lactation
* Adults with current decisional impairment

Where it's running

  • National Institutes of Health Clinical Center
    Bethesda, Maryland, United States
    Recruiting

Study contacts

  • Principal investigator: Warren J Leonard, M.D. — National Heart, Lung, and Blood Institute (NHLBI)
  • Study coordinator: Warren J Leonard, M.D.
  • Email: wl2w@nih.gov
  • Phone: (301) 496-0098

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.