Host and Bacterial Mechanisms During Cystic Fibrosis Pulmonary Exacerbations

April 7, 2026 updated by: National Jewish Health

Host and Bacterial Mechanisms in Recovering FEV1 After Pulmonary Exacerbations in Patients With Cystic Fibrosis

Cystic fibrosis pulmonary exacerbations (CF PEx) vary greatly in their severity, their pathogens, and their treatment responses. A failure to return to baseline lung function after treatment may be due to persistent infection or chronic inflammation or both. This constant infection and inflammation are believed to be tightly connected, making it difficult to know the exact reason why some patients fail to respond to treatment. The purpose of this study is to evaluate both infection and inflammation during CF PEx to allow for more personalized approaches to improve lung function responses and better CF PEx outcomes. Subjects will be asked to be in the study if they have CF, are 18 years of age or older, and are starting on IV antibiotics due to worsening lung infection. Subjects will stay in the study for up to 5 years, with visits occurring once a year if hospitalized for a CF PEx. Each visit will have blood, sputum, and urine collected and analyzed for changes in expression of certain genes and proteins. These changes may relate to improvements felt by people living with CF and determine what treatments are most helpful.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
29

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Colorado
      • Denver, Colorado, United States, 80206
        • National Jewish Health

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Sampling Method

Probability Sample

Study Population

Patients followed by the Colorado Adult CF Center will be eligible. A subject will have a diagnosis of cystic fibrosis, be 18 years or older, and been diagnosed by clinical faculty with a pulmonary exacerbation (PEx) and need to be hospitalized to start on IV antibiotic treatment.

Description

Inclusion Criteria:

  • CF patients 18 years or older
  • hospitalized for IV treatment of an acute pulmonary exacerbation
  • not on investigational drugs
  • who can provide written consent and are willing to comply with study procedure

Exclusion Criteria:

• the presence of a condition or abnormality that, in the opinion of the Principal Investigator, would compromise the safety of the patient or the quality of the data.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change between FEV1 and Th17/PD-1 expression during the course of treatment for pulmonary exacerbations using flow cytometry
Time Frame: Onset and end of CF pulmonary exacerbations, on average 10 days apart
There is a Th17 skewing association with a failure to return to baseline FEV1 values post pulmonary exacerbation, as measured using conventional flow cytometry followed by linear mixed effects models.
Onset and end of CF pulmonary exacerbations, on average 10 days apart
Change between FEV1 and Th17/PD-1 expression over time using flow cytometry
Time Frame: From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months
There is a Th17 skewing association with a failure to return to baseline FEV1 values post pulmonary exacerbation, as measured using conventional flow cytometry followed by linear mixed effects models.
From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months
Change in FEV1 and Th1/Th2/Th17 gene expression during the course of treatment for pulmonary exacerbations using single cell sequencing
Time Frame: Onset and end of CF pulmonary exacerbations, on average 10 days apart
Gene expression changes, with a particular emphasis on the relationship between changing cell composition (Th1, Th2, and Th17) single cell gene expression and FEV1 recovery, as measured by single cell sequencing of CD4+CD45RO+ memory cells, may be associated with a failure to return to baseline FEV1 during the course of treatment.
Onset and end of CF pulmonary exacerbations, on average 10 days apart
Change in FEV1 and Th1/Th2/Th17 gene expression over time using single cell sequencing
Time Frame: From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months
Gene expression changes, with a particular emphasis on the relationship between changing cell composition (Th1, Th2, and Th17) single cell gene expression and FEV1 recovery, as measured by single cell sequencing of CD4+CD45RO+ memory cells, may be associated with a failure to return to baseline FEV1 over time.
From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months
Comparison of Th17 vs Th2 TCR repertoires during the course of treatment for pulmonary exacerbations through bulk TCR beta sequencing
Time Frame: Onset and end of CF pulmonary exacerbations, on average 10 days apart
Examining if an expanded clone within the Th17 lineage translates to greater inflammation and poorer FEV1 response during the course of treatment as measured by bulk TCR beta sequencing.
Onset and end of CF pulmonary exacerbations, on average 10 days apart
Comparison of Th17 vs Th2 TCR repertoires over time through bulk TCR beta sequencing
Time Frame: From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months
Examining if an expanded clone within the Th17 lineage translates to greater inflammation and poorer FEV1 response over time as measured by bulk TCR beta sequencing.
From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
National Jewish Health

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 7, 2020

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 21, 2021

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 22, 2023

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 13, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 16, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 21, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
April 13, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 7, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • SAAVED19G0

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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