A Phase 2b Randomized, Double-blind, Placebo-controlled, Repeat-dose, Multicenter Trial to Evaluate the Efficacy, Safety and Tolerability of HZN-825 in Subjects With Idiopathic Pulmonary Fibrosis
HZNP-HZN-825-303 (HARBOR) comprises of 2 parts. Part 1 (Core Phase) is a randomized, double-blind, placebo-controlled, repeat-dose, multicenter trial to evaluate the efficacy, safety and tolerability of HZN-825 in participants with Idiopathic Pulmonary Fibrosis (IPF). Part 2 (Extension Phase) is an optional, open-label, repeat-dose, multicenter extension of the Core Phase. The trial will include up to an 8-week Screening Period and a 52-week Double-blind Treatment Period in the Core Phase and 52 weeks of open-label HZN-825 treatment in the Extension Phase. During the Core Phase, participants will be screened within 8 weeks prior to the baseline (Day 1) Visit. Approximately 135 participants who meet the trial eligibility criteria will be randomly assigned in a 1:1:1 ratio on Day 1 to receive HZN-825 300 mg QD, HZN-825 300 mg BID or matching placebo orally for 52 weeks using the following 2 stratification factors: 1. Concomitant use of approved IPF therapy (i.e., nintedanib or pirfenidone): yes or no 2. Forced vital capacity (FVC) % predicted at Baseline: ≥70% or \<70% Participants who complete the 52-week Double blind Treatment Period of the Core Phase of the trial will be invited to extend their participation in the 52-week Extension Phase of the trial.
• Male or female ≥18 years of age at Screening.
• Current diagnosis of IPF, as defined by American Thoracic Society (ATS)/European Respiratory Society (ERS)/Japanese Respiratory Society (JRS)/Latin American Thoracic Society (ALAT) guidelines and determined by central review; the date of initial diagnosis of IPF should be ≤7 years prior to Screening.
• No recent changes or planned changes to the dose or regimen for IPF therapy, defined as:
‣ Receiving a stable dose of IPF-approved therapy (i.e., nintedanib or pirfenidone) for a minimum of 3 months prior to Day 1 with no plans to change the background regimen during trial participation, or
⁃ Not currently receiving background IPF-approved therapy at Screening (either naïve to IPF-approved therapy or previously discontinued any IPF-approved therapy at least 4 weeks prior to Day 1 or drug-specific, 5 half-lives elimination period if longer than 4 weeks), and with no current plans to restart treatment during trial participation
⁃ Participants receiving any additional agent for IPF therapy must be on a stable regimen for at least 3 months prior to Day 1 with no current plans to change the treatment regimen during trial participation. Any previously discontinued therapy used to treat IPF must have been discontinued at least 4 weeks prior to Day 1 or 5 half-lives for that specific therapy must have elapsed, whichever is longer, with no plans to restart the therapy during trial participation.
• Lung high-resolution computed tomography (HRCT) historically performed within 6 months prior to the Screening Visit and according to the minimum requirements for IPF diagnosis by central review based on participant's HRCT. If an evaluable HRCT is not available within 6 months prior to Screening, an HRCT will be performed at Screening to determine eligibility, according to the same requirements as the historical HRCT.
• HRCT shows ≥10% to \<50% parenchymal fibrosis (reticulation) and the extent of fibrotic changes is greater than the extent of emphysema on the most recent HRCT scan (central reviewer determined).
• Meets all of the following criteria during the Screening Period:
∙ FVC ≥45% predicted of normal
‣ forced expiratory volume in 1 second (FEV1)/FVC ≥0.7
‣ Diffusing capacity of the lungs for carbon monoxide (DLCO) corrected for hemoglobin is ≥25% and ≤90% predicted of normal
• Estimated minimum life expectancy of ≥30 months for non-IPF-related disease, in the opinion of the Investigator.
• Vaccinations are up to date given age, comorbidities and local availability prior to trial drug dosing.
• Willing and able to comply with the prescribed treatment protocol and evaluations for the duration of the trial.
• Completed the Double-blind Treatment Period (Week 52) of the Core Phase of the trial; subjects prematurely discontinued from trial drug in the Core Phase of the trial for reasons other than safety or tolerability may be included at the discretion of the Investigator after completing scheduled visits, including Week 52 assessments.
• Willing and able to comply with the prescribed treatment protocol and evaluations for the duration of the Extension Phase of the trial.