AsthmaNCT00339521
Genetic Susceptibility to Childhood Respiratory IIlness in Mexico City
An observational study of Asthma, run by National Institute of Environmental Health Sciences (NIEHS) at 1 site in Mexico.
Trial summary
We propose to add a collection of genetic material to a clinical trial of anti-oxidant supplementation for the amelioration of asthma in 7-12 year olds being conducted at a public pediatric hospital in Mexico City. Read more about this study
- Who is it for?
- Ages 4 to 17 years
- Conditions the study is for
- Asthma
- How many people
- 2,362 participants
- Where
- 1 siteMexico
- Study dates
- 15 May 1999to 3 Dec 2020
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 4 to 17 years
- All sexes
- No healthy volunteers
- Child
Study population: Asthmatic children registered at the allergy clinic of the Pediatric Hospital Frederico Gomez in Mexico City and their biological parents.
Who may be able to join
- Moderate to severe asthma, ages 7-12 and residing within 5 km of a particular ambient air pollution monitoring station.
Who cannot join
None listed.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Genetic Susceptibility to Childhood Respiratory Illness in Mexico City
We propose to add a collection of genetic material to a clinical trial of anti-oxidant supplementation for the amelioration of asthma in 7-12 year olds being conducted at a public pediatric hospital in Mexico City. The anti-oxidant study has been approved by the Institutional Review Board of the National Institute of Public Health in Mexico City and is scheduled to begin in September 1998. The purpose of this add-on study is to examine genetic polymorphisms that may be related to asthma. Asthma cases will be compared with their parents as controls. In partaicular, we will save the buffy coat from the blood collection being done on the asthmatic child for measurements of plasma micronutrients in the anti-oxidant trial for extraction of DNA. This part of the sample would otherwise be discarded. In addition, we will enroll the parents of the asthmatic child as controls for the child. From the parents, either a 10 ml blood sample or if they prefer, a sample of buccal cells will be collected. Although our current plan is to compare the asthmatic child to the parents using statistical methods based on the "transmission disequilibrium test" because research into various family designs for candidate gene studies is rapidly evolving and various sibling control sample strategies have been discussed, we would also like to collect a genetic sample on as many of the child's siblings as possible with priority given to those closest in age. This will enhance the future usefulness of the samples. We anticipate enrolling approximately 200 families....
Read the detailed description
We propose to add a collection of genetic material to a clinical trial of anti-oxidant supplementation for the amelioration of asthma in 7-12 year olds being conducted at a public pediatric hospital in Mexico City. The anti-oxidant study has been approved by the Institutional Review Board of the National Institute of Public Health in Mexico City and is scheduled to begin in September 1998. The purpose of this add-on study is to examine genetic polymorphisms that may be related to asthma. Asthma cases will be compared with their parents as controls. In particular, we will save the buffy coat from the blood collection being done on the asthmatic child for measurements of plasma micronutrients in the anti-oxidant trial for extraction of DNA. This part of the sample would otherwise be discarded. In addition, we will enroll the parents of the asthmatic child as controls for the child. From the parents, either a 10 ml blood sample or if they prefer, a sample of buccal cells will be collected. Although our current plan is to compare the asthmatic child to the parents using statistical methods based on the "transmission disequilibrium test" because research into various family designs for candidate gene studies is rapidly evolving and various sibling control sample strategies have been discussed, we would also like to collect a genetic sample on as many of the child's siblings as possible with priority given to those closest in age. This will enhance the future usefulness of the samples. We anticipate enrolling approximately 200 families.
- Conditions
- Asthma
- Keywords
- Asthma, Mexico, Triads, Polymorphism, Genetic Predisposition
- Medical subject headings
- Asthma, Genetic Predisposition to Disease
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Case-Parent Triad | Childhood Asthmatics (aged 4-17) are Cases; biologic parents of cases are genetic Controls. |
What is being measured
The primary outcome is the main question the study is designed to answer.
To create a resource to examine genetic susceptibility to asthma in Mexico City.
The role of asthma candidate genes in the association between ozone exposure and asthma incidence.
Measured: End of Study
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Jun 2006 (estimated)
- Study start15 May 1999
- Primary completion12 Feb 2007
- Study completion3 Dec 2020
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for AsthmaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Family based
- Time perspective
- Cross-sectional
- Enrolment
- 2,362 participants (actual)
Sponsor and investigators
- Lead sponsor
- National Institute of Environmental Health Sciences (NIEHS)
- Sponsor type
- US National Institutes of Health
- Responsible party
- Sponsor
- Investigators
- Stephanie London, M.D., Principal investigator, National Institute of Environmental Health Sciences (NIEHS)
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00339521
- Sponsor's protocol ID
- 999999028
- Other IDs
- OH99-E-N028
- Status last verified
- Dec 2020
- First submitted
- 19 Jun 2006
- Last updated
- 4 Dec 2020
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Sandford A, Weir T, Pare P. The genetics of asthma. Am J Respir Crit Care Med. 1996 Jun;153(6 Pt 1):1749-65. doi: 10.1164/ajrccm.153.6.8665031.
PubMed 8665031Hopes E, McDougall C, Christie G, Dewar J, Wheatley A, Hall IP, Helms PJ. Association of glutamine 27 polymorphism of beta 2 adrenoceptor with reported childhood asthma: population based study. BMJ. 1998 Feb 28;316(7132):664. doi: 10.1136/bmj.316.7132.664. No abstract available.
PubMed 9522789Slutsky AS, Zamel N. Genetics of asthma: the University of Toronto Program. University of Toronto Genetics of Asthma Research Group. Am J Respir Crit Care Med. 1997 Oct;156(4 Pt 2):S130-2. doi: 10.1164/ajrccm.156.4.12tac-10.
PubMed 9351593
Study at a glance
From the registry record, last updated by the sponsor on 4 Dec 2020. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Genetic Susceptibility to Childhood Respiratory Illness in Mexico City
- ClinicalTrials.gov ID
- NCT00339521
- Acronym / sponsor ID
- 999999028
- Conditions
- Asthma
- Keywords
- Asthma, Mexico, Triads, Polymorphism, Genetic Predisposition
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 2,362 participants (actual)
- Lead sponsor
- National Institute of Environmental Health Sciences (NIEHS)US National Institutes of Health
- Study start
- 15 May 1999 (actual)
- Primary completion
- 12 Feb 2007 (actual)
- Study completion
- 3 Dec 2020 (actual)
- First posted
- 21 Jun 2006 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
We propose to add a collection of genetic material to a clinical trial of anti-oxidant supplementation for the amelioration of asthma in 7-12 year olds being conducted at a public pediatric hospital in Mexico City. The anti-oxidant study has been approved by the Institutional Review Board of the National Institute of Public Health in Mexico City and is scheduled to begin in September 1998. The purpose of this add-on study is to examine genetic polymorphisms that may be related to asthma. Asthma cases will be compared with their parents as controls. In partaicular, we will save the buffy coat from the blood collection being done on the asthmatic child for measurements of plasma micronutrients in the anti-oxidant trial for extraction of DNA. This part of the sample would otherwise be discarded. In addition, we will enroll the parents of the asthmatic child as controls for the child. From the parents, either a 10 ml blood sample or if they prefer, a sample of buccal cells will be collected. Although our current plan is to compare the asthmatic child to the parents using statistical methods based on the "transmission disequilibrium test" because research into various family designs for candidate gene studies is rapidly evolving and various sibling control sample strategies have been discussed, we would also like to collect a genetic sample on as many of the child's siblings as possible with priority given to those closest in age. This will enhance the future usefulness of the samples. We anticipate enrolling approximately 200 families....
Detailed description
We propose to add a collection of genetic material to a clinical trial of anti-oxidant supplementation for the amelioration of asthma in 7-12 year olds being conducted at a public pediatric hospital in Mexico City. The anti-oxidant study has been approved by the Institutional Review Board of the National Institute of Public Health in Mexico City and is scheduled to begin in September 1998. The purpose of this add-on study is to examine genetic polymorphisms that may be related to asthma. Asthma cases will be compared with their parents as controls. In particular, we will save the buffy coat from the blood collection being done on the asthmatic child for measurements of plasma micronutrients in the anti-oxidant trial for extraction of DNA. This part of the sample would otherwise be discarded. In addition, we will enroll the parents of the asthmatic child as controls for the child. From the parents, either a 10 ml blood sample or if they prefer, a sample of buccal cells will be collected. Although our current plan is to compare the asthmatic child to the parents using statistical methods based on the "transmission disequilibrium test" because research into various family designs for candidate gene studies is rapidly evolving and various sibling control sample strategies have been discussed, we would also like to collect a genetic sample on as many of the child's siblings as possible with priority given to those closest in age. This will enhance the future usefulness of the samples. We anticipate enrolling approximately 200 families.
Study design
- Observational model
- Family based
- Time perspective
- Cross-sectional
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Case-Parent Triad | – | –Childhood Asthmatics (aged 4-17) are Cases; biologic parents of cases are genetic Controls. |
Who may qualify
- Ages
- 4 to 17 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child
- Study population
- Asthmatic children registered at the allergy clinic of the Pediatric Hospital Frederico Gomez in Mexico City and their biological parents.
Key inclusion criteria (1 listed)
- Moderate to severe asthma, ages 7-12 and residing within 5 km of a particular ambient air pollution monitoring station.
Key exclusion criteria (0 listed)
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
To create a resource to examine genetic susceptibility to asthma in Mexico City.
Time frame: End of Study
The role of asthma candidate genes in the association between ozone exposure and asthma incidence.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 Dec 2020.
- Background: PubMed 8665031Sandford A, Weir T, Pare P. The genetics of asthma. Am J Respir Crit Care Med. 1996 Jun;153(6 Pt 1):1749-65. doi: 10.1164/ajrccm.153.6.8665031.
- Background: PubMed 9522789Hopes E, McDougall C, Christie G, Dewar J, Wheatley A, Hall IP, Helms PJ. Association of glutamine 27 polymorphism of beta 2 adrenoceptor with reported childhood asthma: population based study. BMJ. 1998 Feb 28;316(7132):664. doi: 10.1136/bmj.316.7132.664. No abstract available.
- Background: PubMed 9351593Slutsky AS, Zamel N. Genetics of asthma: the University of Toronto Program. University of Toronto Genetics of Asthma Research Group. Am J Respir Crit Care Med. 1997 Oct;156(4 Pt 2):S130-2. doi: 10.1164/ajrccm.156.4.12tac-10.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Stephanie London, M.D. principal investigator
National Institute of Environmental Health Sciences (NIEHS)
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Asthma, run by National Institute of Environmental Health Sciences (NIEHS) at 1 site in Mexico.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 0 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 4 Dec 2020. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Mexico. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
To create a resource to examine genetic susceptibility to asthma in Mexico City. (time frame: End of Study). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00339521, which also lists 3 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 Dec 2020.