Determining Risk in Latent Tuberculosis
|First Received Date ICMJE||April 4, 2012|
|Last Updated Date||May 21, 2014|
|Start Date ICMJE||January 2012|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||To estimate the rate of PET plus CXR at baseline among all study participants.|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT01571739 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Determining Risk in Latent Tuberculosis|
|Official Title ICMJE||Risk Stratification in Latent Tuberculosis: PET/CT Findings in TB Contacts|
- Tuberculosis (TB) is a leading cause of death worldwide. Those who are exposed to the TB bacteria but have not become sick are said to have latent TB. Many people with latent TB will not get sick from it, but some people will develop active TB and become sick. Much is known about how to treat and diagnose active TB, but little is known about the best way to treat latent TB. Researchers also want to know more about the risk that latent TB will develop into active TB, and whether it is possible to test for this risk.
- To test possible methods of determining a person s risk for developing active TB.
- Individuals between 20 and 60 years of age who (1) have active TB, (2) were exposed to someone with active TB in the past 9 months, or (3) have not been exposed to TB.
The efficacy of treating tuberculin skin test (TST) positive, or interferon gamma release assay (IGRA) positive, contacts of tuberculosis (TB) cases to prevent progression to disease is well established. However the length of treatment, and the toxicity associated with the currently used regimens, means that the risk may outweigh the benefit and treatment completion rates are poor. In addition, no proven regimens are available for contacts of multidrug resistant tuberculosis (MDR-TB) cases. Because as few as 2% of contacts develop active TB over 1 year and no surrogate markers are available, drug trials to assess novel treatments typically require thousands of subjects followed up for many years. (18F)-fluoro-2-deoxy-D-glucose positron emission tomography/computer tomography (FDG-PET/CT) may prove a useful surrogate for more targeted chemoprophylaxis as well as a means to rapidly evaluate novel prophylactic regimes in future studies.
Up to 40% of immune-sensitized TB contacts with normal chest radiographs (CXR) have abnormalities on conventional chest CT. FDG-PET/CT not only will allow characterization of the metabolic activity of these lesions but is also likely to reveal significantly increased metabolic activity within regional lymph nodes that may otherwise be anatomically normal. Based on previous studies, we predict that up to 65% of contacts will have combined chest PET/CT abnormalities and that up to 50% of contacts who are treated, will have increased FDG uptake that will resolve with treatment. By contrast, PET screening studies demonstrate abnormal pulmonary FDG uptake occurs in 0.9% of healthy individuals.
The development of biomarkers more predictive of disease progression is also highly desirable, but for similar reasons evaluating them is challenging. This novel approach of using FDG-PET/CT to benchmark the dynamic immunological, transcriptional, or metabolic changes that occur early in tuberculosis infection, we hope will accelerate biomarker discovery. In this study we propose to evaluate these predictions in order to lay the foundation for future studies.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Time Perspective: Prospective|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Condition ICMJE||Latent Tuberculosis|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Terminated|
|Estimated Enrollment ICMJE||1200|
|Completion Date||May 2014|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
20 Smear Positive Pulmonary TB Biomarker Index Case Controls:
1) Culture negative for M.tb
QF-GIT Positive Contacts:
|Ages||20 Years to 60 Years|
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||Korea, Republic of|
|NCT Number ICMJE||NCT01571739|
|Other Study ID Numbers ICMJE||999912036, 12-I-N036|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Institute of Allergy and Infectious Diseases (NIAID)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||May 2014|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP