# A Prospective Observational Study of Biopredictors of Bronchial Thermoplasty Response in Patients With Severe Refractory Asthma (BTR Study)

> **NCT01185275** · — · COMPLETED · sponsor: **Washington University School of Medicine** · enrollment: 133 (actual)

## Conditions studied

- Asthma

## Interventions

- **DEVICE:** Alair system

## Key facts

- **NCT ID:** NCT01185275
- **Lead sponsor:** Washington University School of Medicine
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2010-08
- **Primary completion:** 2019-10-01
- **Final completion:** 2019-10-01
- **Target enrollment:** 133 (ACTUAL)
- **Last updated:** 2020-11-27

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT01185275

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT01185275, "A Prospective Observational Study of Biopredictors of Bronchial Thermoplasty Response in Patients With Severe Refractory Asthma (BTR Study)". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT01185275. Licensed CC0.

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