A Phase 2, Multi-Center, Randomized, Double-Blind, Controlled Trial Evaluating the Safety and Efficacy of ENV-101 in Patients with Lung Fibrosis (WHISTLE-PF Trial)
Recipient organisationNIHR Leicester Biomedical Research Centre
NIHR supportRecorded as supported by this research centre
PeriodFeb 2025 — Jun 2026
In plain English
AI plain-English summary
A daily tablet of an experimental cancer drug is being tested to see if it can halt the scarring that stiffens and destroys the lungs in people with idiopathic pulmonary fibrosis (IPF). Current treatments only modestly slow the inevitable decline in lung function, leaving patients with a progressive, fatal disease and no cure. This trial repurposes ENV-101, a molecule originally developed for advanced cancer, to target the biological pathways driving fibrosis. If the drug proves safe and effective, it could offer a fundamentally new therapeutic option for a condition where significant advances are urgently needed. Success would mean slowing or stopping the loss of lung elasticity and capacity, potentially extending the time patients can breathe without supplemental oxygen or maintain daily activities. The trial is a randomised, double-blind, placebo-controlled study, meaning neither patients nor doctors will know who receives the active drug. This rigorous design ensures that any measured benefit is genuinely due to the treatment, not expectation or bias.
View original technical description
The purpose of this study is to learn more about the medication ENV-101 by studying the safety and efficacy of ENV-101 tablets for the treatment of Idiopathic Pulmonary Fibrosis (IPF) when the tablet is taken orally as a daily dose for 24 weeks.ENV-101 is an investigational drug that was originally developed as a treatment for patients with advanced cancer. Endeavor Biomedicines (Sponsor of the study) is repurposing the molecule for use in the treatment of IPF. IPF is a form of interstitial lung disease (ILD), which are progressive fibrotic lung scarring diseases that result in loss of lung elasticity, capacity, and function. Current therapeutic options for these diseases are limited to drugs that modestly slow the rate of lung function decrease. Significant advances are urgently needed for patients. This is a randomized, double-blind trial (study doctor and participants won’t know if a participant is receiving ENV-101 or placebo). Participants will be assigned to one of three dose levels of ENV-101 or placebo and will have a 25% chance of receiving placebo.Participants will be required to undergo a HRCT (High Resolution Computed Tomography) scan to examine their lungs. The risk posed by radiation exposure from the scan is considered low. Blood sampling and ECG (electrocardiogram; a recording of heart electrical activity) will also be performed.Approximately 200 patients will take part in the study across 16 countries at approximately 100 sites worldwide. The study duration is approximately 18 months, with participant duration of approximately 7 months.
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