Environmental Risk Factors for the Anti-synthetase Syndrome
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|ClinicalTrials.gov Identifier: NCT01276470|
Recruitment Status : Recruiting
First Posted : January 13, 2011
Last Update Posted : August 4, 2020
|First Submitted Date||January 12, 2011|
|First Posted Date||January 13, 2011|
|Last Update Posted Date||August 4, 2020|
|Actual Study Start Date||February 9, 2011|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures
||To determine if selected noninfectious environmental exposures are more common prior to disease in recent-onset pts w/anti-sythetase syndrome compared w/controls w/o autoimmune disease & compared w/recent-onset myositis pts w/o anti-synt... [ Time Frame: Enrollment ]
Environmental Questionnaire (EQ) and Child Environmental Questionnaire (CQ)
|Original Primary Outcome Measures||Not Provided|
|Current Secondary Outcome Measures||Not Provided|
|Original Secondary Outcome Measures||Not Provided|
|Current Other Pre-specified Outcome Measures||Not Provided|
|Original Other Pre-specified Outcome Measures||Not Provided|
|Brief Title||Environmental Risk Factors for the Anti-synthetase Syndrome|
|Official Title||Environmental Risk Factors for the Anti-Synthetase Syndrome|
- To determine whether selected infectious and noninfectious environmental exposures are more common in individuals who have myositis with the anti-synthetase syndrome, compared with healthy volunteers.
- Individuals who have been diagnosed with myositis (with or without anti-synthetase autoantibodies), and healthy volunteers without autoimmune disorders.
Most autoimmune diseases are thought to develop as a result of chronic immune activation and dysregulation after selected environmental exposures in genetically susceptible individuals. Based on prior studies suggesting roles for noninfectious and infectious agents in the development of myositis, as well as the known clinical, epidemiologic and genetic differences among phenotypes, we hypothesize that different myositis phenotypes are triggered by different environmental exposures in genetically susceptible individuals. One phenotype that is particularly well-defined clinically and genetically, and for which environmental triggers are likely, is myositis associated with anti-synthetase autoantibodies (defined as the anti-synthetase syndrome). These patients have an acute myositis onset in the spring of the year and also tend to develop fevers, elevated white blood cell counts, arthritis and interstitial lung disease. Although these features are consistent with an environmental trigger for the anti-synthetase syndrome, and although case reports and animal models suggest infectious or noninfectious agents may play a role, no study has systematically assessed environmental agents in this population.
In collaboration with multiple centers, we plan to test the hypothesis that certain environmental exposures are associated with the anti-synthetase syndrome and differ from those seen in matched controls and in myositis patients without the anti-synthetase syndrome. The specific aims of this study are to: 1) determine whether selected noninfectious environmental exposures are more common preceding disease onset in 150 recent-onset (defined as within 24 months of meeting criteria for possible, probable or definite myositis) myositis patients with the anti-synthetase syndrome, compared with 150 control subjects without autoimmune disease (1:1 matched with the patients), and compared with 150 recent-onset myositis patients without the anti-synthetase syndrome; and 2) determine whether selected infectious agents can be detected more frequently in blood samples of recent-onset anti-synthetase syndrome patients compared with matched controls, and in blood or biopsy samples from recent-onset anti-synthetase myositis patients compared with recent-onset myositis patients without the anti-synthetase syndrome.
Medical histories, concurrent conditions and environmental questionnaire information will be collected from all participants. Subjects will undergo a clinical, laboratory and immunologic assessment to document current diagnoses, disease manifestations and severity. A chest x-ray, high resolution computed tomography (HRCT) of the chest, pulmonary function tests, bronchoalveolar lavage, and muscle and lung biopsies will be performed as clinically indicated. Blood DNA and RNA sera, biopsy and house dust repositories will be created for current and future investigations.
|Study Design||Observational Model: Case-Control
Time Perspective: Cross-Sectional
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Probability Sample|
|Study Population||General population; There are no gender or ethnic restrictions to enrollment in the study. Age restrictions for children do apply to enrollment in the study.@@@@@@|
|Publications *||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Original Estimated Enrollment
|Study Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
There are no gender, ethnic or age restrictions to enrollment in the study.
The inclusion criteria for enrollment of myositis subjects are:
The inclusion criteria for controls are:
The exclusion criteria for myositis subjects are:
The exclusion criteria for all protocol subjects are:
HIV is not an exclusion for affected participants in this study for the two following reasons:
|Ages||2 Years to 120 Years (Child, Adult, Older Adult)|
|Accepts Healthy Volunteers||Yes|
|Listed Location Countries||United States|
|Removed Location Countries|
|Other Study ID Numbers||110072
|Has Data Monitoring Committee||Not Provided|
|U.S. FDA-regulated Product||Not Provided|
|IPD Sharing Statement||Not Provided|
|Responsible Party||National Institutes of Health Clinical Center (CC) ( National Institute of Environmental Health Sciences (NIEHS) )|
|Study Sponsor||National Institute of Environmental Health Sciences (NIEHS)|
|PRS Account||National Institutes of Health Clinical Center (CC)|
|Verification Date||July 24, 2020|