NCT07285655 · Liquidia Technologies, Inc.
A Phase 3 Study to Evaluate the Safety and Efficacy L606 in Participants With PH-ILD
(Re-Spire)
What this study is about
The purpose of this study is to find out if L606 is safe and if it helps people with high blood pressure in the lungs (pulmonary hypertension) caused by interstitial lung disease (PH-ILD, WHO Group 3). One of the main ways the study will check this is by seeing if people can walk further in six minutes (called the "six-minute walk test").
View original scientific description
The purpose of this study is to find out if L606 is safe and if it helps people with high blood pressure in the lungs (pulmonary hypertension) caused by interstitial lung disease (PH-ILD, WHO Group 3). One of the main ways the study will check this is by seeing if people can walk further in six minutes (called the "six-minute walk test"). Another important (secondary) goal is to see how long it takes for PH-ILD to get worse while people are taking L606. One way the study will measure this is by looking at the distance people walk at different times in the study on different doses of L606. Throughout the study, doctors will also closely monitor for any side effects people have to make sure L606 is safe. People who decide to join this study will be randomly (like tossing a coin) placed into one of two groups: one group will get L606 and the other group will get a placebo, which will look like L606 but will not contain any active medicine. At the end of the initial blinded portion of the study, study participants may have the opportunity to enroll in an open-label extension portion of the study where all participants will receive L606.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Participant is between 18 years to 80 years old.
- Has a confirmed diagnosis of ILD based on High Resolution Computed Tomography (HRCT) chest imaging.
- Evidence of PH as demonstrated from Right Heart Catheterization (RHC) with the following hemodynamic parameters:
- Pulmonary vascular resistance (PVR) ≥ 320 dynes.sec/cm5 (i.e. 4 Woods Units (WU)), and
- Mean Pulmonary Artery Pressure (mPAP) of ≥ 25 mmHg, and
- \- Pulmonary capillary wedge pressure (PCWP) or Left-Ventricular End Diastolic Pressure (LVEDP) of ≤ 15 mmHg.
- FEV1/FVC (ratio) \> 0.70.
- 6-minute walk distance ≥ 150 meters
Exclusion criteria
- PH in the updated WHO Classification Groups 1, 2, 4, or 5.
- Has evidence of clinically significant left-sided heart disease as defined by echocardiography.
- Participants with history of persistent/permanent or uncontrolled atrial fibrillation.
- Participants with severe obstructive sleep apnea.
- Has experienced exacerbation of underlying lung disease or active respiratory infection requiring antibiotics.
- Initiation of pulmonary rehabilitation. Note: Other protocol defined inclusion/exclusion criteria may apply.
Where
- Scottsdale, Arizona
- Tampa, Florida
- Chicago, Illinois
- Indianapolis, Indiana
- Bend, Oregon
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 29, 2026 · Source of record for eligibility and locations