NHALES (Natural History of Asthma With Longitudinal Environmental Sampling)

Recruiting

• Conditions: Asthma

• Registration Number: NCT02327897
• Lead Sponsor: National Institute of Environmental Health Sciences (NIEHS)

Brief Summary

Background:

- Asthma is a serious clinical and public health problem. Researchers want to collect data to better understand how bacteria and other things in the environment can affect people's asthma.

Eligibility:

- Nonsmoking adults age 18 - 60 who have moderate to severe asthma.

Design:

* Participants will complete a medical history form before the first visit.

* Study visits will include collecting medical history, and conducting physical exam, lung and smoking tests. Participants will give blood, urine, stool, dust, saliva, and sputum samples.

* Participants will take tests that measure their breathing abilities. They will give saliva samples for DNA study. They will get kits to collect stool and dust samples at home. They will fill out surveys.

* Participants will have visits every 6 months for 5 years. They can schedule sick visits, if needed, at no cost to the participant. For all visits, they will have asthma check-ups and get treatment, at no cost to the participant.

* Some participants may take part in a sub-study that includes one 4-hour visit. They will have medical history, physical exam, and lung tests. They will have urine tests to check for pregnancy and tobacco exposure. Then they will have bronchoscopy. For this, an intravenous line will be placed in an arm vein. The nose and throat will be numbed. A flexible fiber-optic tube will be inserted into their airways through the nose. Their airways will be examined and areas of their lung will be washed. A small sample of cells will be taken.

Detailed Description

This study will be a prospective, longitudinal, observational, single-center, exploratory, natural history study to collect samples and data that will enable prospective explorations of the interaction between environmental exposures and disease progression over time in moderate-severe atopic asthmatics with persistent disease, and facilitate the formation of mechanistic hypotheses. Environmental and body microbiome samples will be collected and stored from participants for future correlation to effects on asthma symptoms and control.

Samples of blood, urine, DNA, saliva, sputum, stool, and household dust will be collected from approximately 200 participants, as well as quality of life information using asthma symptom questionnaires and, if consented, through the use of home devices. Additionally, samples will be collected from the airways of participants enrolled in the bronchoscopy visit. The samples and survey information collected may be used to explore the microbiological and genetic influences of atopic asthma. Data from the analyses of these samples and survey responses may be evaluated in the context of the environmental exposures, clinical outcomes (symptoms, exacerbations, and quality of life), and response to therapy.

Male and female participants aged 18 to 60 years old with moderate-severe, symptomatic atopic asthma will be enrolled. Participants will be excluded from enrollment if they have a history of chronic obstructive pulmonary disease, cystic fibrosis, non-cystic fibrosis bronchiectasis, pulmonary fibrosis, pulmonary hypertension, emphysema, sarcoidosis, or unstable angina. Additionally, participants will be excluded if they have DVT, pulmonary embolism, class III - IV congestive heart failure, or a malignancy under treatment. Current smokers, and individuals who are allergic to methacholine will not be eligible to enroll. Participants will be enrolled for five years and will receive standard of care asthma therapy as indicated. After the initial screening and baseline visits, participants will return for visits semi-annually and for sick visits as needed. Volunteers participating in the bronchoscopy visit will have an additional single visit after completing the baseline visit.

This cohort of 200 participants will form the basis for future asthma study recruitment, and analysis of collected samples and data. Further expansion of the study beyond five years and 200 participants will be desirable if logistically possible.

Study Timeline

• Study First Submitted: 2014-12-30
• Study First Submitted QC: 2014-12-30
• Study First Posted: 2014-12-31
• Study Start: 2015-09-10
• Status Verified: 2025-03-07
• Last Update Submitted: 2025-05-31
• Last Update Posted: 2025-06-03
• Primary Completion: 2030-04-01
• Study Completion: 2030-04-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 400

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
The overall goal is to study the natural history of atopic asthma, focusing on moderate to severe asthma. The primary objective is to collect prospective data and samples for future use to better understand the interaction between environmental ...	End of Study	Results will be evaluated in the context of the environmental exposures, clinical outcomes (symptoms, exacerbations, and quality of life), and response to therapy.

Trial Locations

Locations (1)

NIEHS Clinical Research Unit (CRU); 🇺🇸 Research Triangle Park, North Carolina, United States