BElumosudil for Bronchiolitis Obliterans Prevention/Therapy (BEBOP)

An Open-Label, Phase 2 Study to Evaluate the Activity of Belumosudil in Subjects With New Onset and Incipient Bronchiolitis Obliterans Syndrome Following Allogeneic Hematopoietic Cell Transplantation

The goal of this research study is to test the efficacy of a novel immunosuppressive agent, belumosudil, in allogeneic hematopoietic stem cell transplant (HSCT) recipients who have been newly diagnosed or have developing (early stage) bronchiolitis obliterans syndrome (BOS).

The name of the study drugs involved in this study are:

• Belumosudil (an immunotherapy)
• Fluticasone (an intranasal corticosteroid)
• Azithromycin (an antibiotic)
• Montelukast (a leukotriene receptor antagonist)
• Prednisone (a corticosteroid)

Study Overview

• Status: Recruiting
• Conditions: Chronic Graft Versus Host Disease; Lung Diseases; Bronchiolitis Obliterans; Bronchiolitis Obliterans Syndrome
• Intervention / Treatment: Drug: Belumosudil; Drug: Fluticasone; Drug: Azithromycin; Drug: Prednisone; Drug: Montelukast

Detailed Description

This is an open-label, single-arm, single-stage phase 2 study to evaluate the activity of Belumosudil in subjects with new onset of bronchiolitis obliterans syndrome (BOS) (Cohort A) and for subjects with incipient BOS (Cohort B) following allogeneic hematopoietic cell transplantation (HCT). Belumosudil is a novel immunosuppressive agent that has both immunosuppressive activity as well as antifibrotic (slowing down the rate of fibrosis or scarring in the lungs) properties.

Participants will be placed into one of two treatment groups: Group A Belumosudil + standard of care medications for BOS versus Group B Belumosudil only.

The U.S. Food and Drug Administration (FDA) has not approved belumosudil for the initial or preventative therapy of BOS, but it has been approved for the treatment of Chronic Graft Versus Host Disease (cGVHD).

The other study drugs, Fluticasone, Azithromycin, Montelukast, and Prednisone are FDA approved as standard of care drugs for BOS.

Study procedures include screening for eligibility, treatment visits, blood tests, pulmonary function tests, bronchoscopy wit bronchoalveolar lavage, and Computed Tomography (CT) Scans.

Participants will receive study treatment for 11 months (48 weeks) and will be followed for an additional 12 months after completion of study treatment.

It is expected that about 45 people (30 in Group A and 15 in Group B) will take part in this research study.

The National Heart, Lung, and Blood Institute (NHLBI) is supporting this research study by providing funding.

Sanofi is supporting this research study by providing study drug, Belumosudil.

• Study Type: Interventional
• Enrollment (Estimated): 45
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Corey Cutler, MD, MPH; Phone Number: 617-632-5946; Email: CSCUTLER@PARTNERS.ORG

Study Locations

• United States
  • Massachusetts
    • Boston, Massachusetts, United States, 02115
      • Recruiting
      • Dana-Farber Cancer Institute
      • Principal Investigator: Corey Cutler, MD, MPH
      • Contact: Corey Cutler, MD, MPH; Phone Number: 617-632-3470; Email: cscutler@partners.org
    • Boston, Massachusetts, United States, 02215
      • Not yet recruiting
      • Brigham and Women's Hospital
      • Contact: Corey Cutler, MD, MPH; Phone Number: 617-632-5946; Email: CSCUTLER@PARTNERS.ORG
    • Boston, Massachusetts, United States, 02215
      • Not yet recruiting
      • Boston Children's Hospital
      • Contact: Corey Cutler, MD, MPH; Phone Number: 617-632-5946; Email: CSCUTLER@PARTNERS.ORG
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • Recruiting
      • University of Michigan
      • Principal Investigator: Gregory A Yanik, MD, BS
      • Contact: Gregory A Yanik, MD, BS; Phone Number: 8008651125; Email: gyanik@med.umich.edu
  • Washington
    • Seattle, Washington, United States, 98109
      • Recruiting
      • Fred Hutchinson Cancer Center
      • Principal Investigator: Guang-Shing Cheng, MD
      • Contact: Guang-Shing Cheng; Email: gcheng2@fredhutch.org

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria Cohort A:

• Diagnosis of BOS after HCT using pulmonary function testing, per the NIH diagnostic criteria17 OR the Atypical BOS criteria33 3.1.2.1 NIH Diagnostic Criteria for BOS. All of the following must be met:

  • FEV1/VC < 0.7 or <5th percentile of predicted (FEV1 = Forced Expiratory Volume in 1 second; VC = Vital Capacity (either FVC, Forced Vital Capacity, or SVC, Slow Vital Capacity, whichever is greater)
  • FEV1 <75% of predicted with ≥ 10% absolute decline over less than 2 years. FEV1 should not correct to >75% of predicted with albuterol, and the absolute decline for the corrected values should still remain ≥ 10% over 2 years.
  • Absence of active infection in the respiratory tract, documented with investigations directed by clinical symptoms, such as chest radiographs or computed tomographic scans or microbiologic cultures (sinus aspiration, upper respiratory tract viral screen, sputum culture, bronchoalveolar lavage).

  • One of the two supporting features of BOS:

    • i - Evidence of air trapping by expiratory CT or small airway thickening or bronchiectasis by high-resolution chest CT OR
    • ii - Evidence of air trapping by PFTs: RV (Residual Volume) > 120% of predicted or RV/TLC elevated outside the 90% confidence interval (RV/Total Lung Capacity).

• Atypical Criteria for BOS:

  • FEV1 <80% of predicted with ≥ 10% absolute decline over the last 2 years or since transplant. The remote comparator can be an evaluation of PFTs done within 2 years of the PFTs assessment being evaluated to determine eligibility or the PFT assessment done prior to transplant.
  • VC < 80% of predicted.
  • FEV1/VC > 0.7.
  • Absence of active infection in the respiratory tract, documented with investigations directed by clinical symptoms, such as chest radiographs or computed tomographic scans or microbiologic cultures (sinus aspiration, upper respiratory tract viral screen, sputum culture, bronchoalveolar lavage) or active non-infectious lung disease (such as interstitial lung disease) that explain spirometric changes or chest CT findings.

Inclusion Criteria for Cohort B:

-Diagnosis of BOS-0p

• Decline in FEV1 of 10% - 19% of predicted compared with pretransplant testing OR
• Decline in predicted FEF25-75% (Forced Expiratory Flow between 25% and 75% of vital capacity) > 25%

Inclusion Criteria for Cohorts A and B:

• Age ≥18 years. Belumosudil is currently being tested in pediatric populations and the safety and efficacy in pediatric patients have not yet been established. A protocol amendment to include pediatric patients will be considered once safety in pediatric patients is established.
• ECOG performance status ≤2 (Karnofsky ≥ 60%).

• Participants must have adequate organ and marrow function as defined below:

  • WBC ≥ 3,000/μL
  • Absolute neutrophil count ≥ 1,500/ μL
  • Platelets ≥ 50,000/mcL
  • AST(SGOT)/ALT(SGPT) ≤ 5 × institutional ULN
• No evidence of relapsed malignancy at the time of enrollment. Formal re-staging is not required for trial entry.
• All females of childbearing potential must have a negative serum or urine pregnancy test < 7 days before study drug administration.
• The ability to understand and willingness to sign a written consent document.

Exclusion Criteria for Cohorts A and B:

• Participants who have received prior therapy specifically for BOS. Therapy for cGVHD in the absence of BOS is permissible.
• Prior exposure to belumosudil.
• Participants who are receiving any other investigational immunosuppressive agents for cGVHD.
• Presence of an active uncontrolled infection. An active uncontrolled infection is defined as hemodynamic instability attributable to sepsis or new symptoms, worsening physical signs, or radiographic findings attributable to infection. Persistent fever without signs or symptoms will not be interpreted as an active uncontrolled infection.
• Known human immunodeficiency virus infection. Interactions between belumosudil and anti-retroviral agents have not been established.
• Active hepatitis B virus (HBV) or hepatitis C virus infection that requires treatment or at risk for HBV reactivation. At risk for HBV reactivation is defined as hepatitis B surface antigen positive or anti-hepatitis B core antibody positive. Subjects with previous positive serology results must have negative polymerase chain reaction results. Subjects whose immune status is unknown or uncertain must have results confirming immune status before enrollment.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Cohort A: Belumosudil + Standard of Care Medications; 30 participants with bronchiolitis obliterans syndrome (BOS) will complete study procedures as follows: Drug diary; CT scans at Cycles 3 and 7 and at End of Treatment.; Cycle 1Day 1 - 28 of 28-day cycle: Predetermined dose of Belumosudil 1x daily.Predetermined doses of Fluticasone, Montelukast, and Prednisone 1x daily.Predetermined dose of azithromycin 3 days per treatment week.; Cycle 2 - 3Day 1 - 28 of 28-day cycle: Predetermined dose of Belumosudil 1x daily.Predetermined doses of Fluticasone Montelukast 1x daily. Predetermined doses of Prednisone 1x daily at treating physician's discretion.Predetermined dose of azithromycin 3 days per treatment week.; Cycle 4 - 12Day 1 - 28 of 28-day cycle: Predetermined dose of Belumosudil 1x daily.Predetermined doses of Fluticasone and Montelukast 1x daily.Predetermined dose of azithromycin 3 days per treatment week.	Drug: Belumosudil; Kinase inhibitor, tablet taken orally; Other Names: Rezurock, KD025, 2-{3-[4-(1H-indazol-5-ylamino)-2-quinazolinyl]phenoxy}-N-(propan-2-yl) acetamide, C26H24N6O2; Drug: Fluticasone; Via inhalation by metered-dose inhaler.; Other Names: Fluticasone Propionate; Drug: Azithromycin; Semi-synthetic macrolide antibiotic, taken orally; Other Names: Zithromax; Drug: Prednisone; Corticosteroid, taken orally; Drug: Montelukast; Leukotriene Receptor Antagonist, taken orally; Other Names: Singulair
Experimental: Cohort B: Belumosudil; 15 participants with signs concerning developing BOS will complete study procedure as follows: Drug diary; CT scans at Cycles 3 and 7 and at End of Treatment.; Cycle 1 - 12 - Day 1 - 28 of 28-day cycle: Predetermined dose of Belumosudil 1x daily.	Drug: Belumosudil; Kinase inhibitor, tablet taken orally; Other Names: Rezurock, KD025, 2-{3-[4-(1H-indazol-5-ylamino)-2-quinazolinyl]phenoxy}-N-(propan-2-yl) acetamide, C26H24N6O2

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
24-week Overall Response Rate (ORR) [Cohort A]	24-week ORR defined as the proportion of participants achieving BOS complete response (CR) or partial response (PR) based on change in FEV1 measurement per criteria of the 2014 NIH Consensus Conference.	up to 24 weeks.
24-week Overall Response Rate (ORR) [Cohort B]	24-week ORR defined as the proportion of participants achieving BOS complete response (CR) or partial response (PR) based on change in FEV1 measurement per criteria of the 2014 NIH Consensus Conference.	up to 24 weeks.
24-week Progression Rate [Cohort B]	24-week progression rate is defined as the proportion of participants experiencing BOS progression based on change in FEV1 measurement per criteria of the 2014 NIH Consensus Conference.	up to 24 weeks.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Grade 3-5 Treatment-Related Toxicity Rate	All grade 3-5 AEs with attribution of probably, possibly or definitely-related to treatment based on CTCAEv5 as reported on case report forms were counted. Rate is the proportion of treated participants experiencing at least one treatment-related grade 3-5 AE of any type during the time of observation.	Evaluated on cycle 1 day 15, cycle 2, 3, 5, 7, 9, 11 (cycle duration=4 weeks) and end of treatment. Observed on treatment up to 12 cycles (48 weeks).
Chronic Graft Versus Host Disease (cGVHD) Response	cGVHD response will be evaluated using non-pulmonary measurements per criteria of the 2014 NIH Consensus Conference.	Evaluated every 8 weeks, up to 48 weeks.
Lee Symptom Scale (LSS) Quality of Life (QOL) Score	Mean and standard deviation Lee Symptom Scale Quality of Life score estimated at each assessment timepoint. The LSS QOL scale is a 30-item measure with answers ranging from 0 "Not at All" to 4 "Extremely." Higher scores indicate greater symptom burden.	Evaluated on cycle 1 day 15, cycle 2, 3, 5, 7, 9, 11 (cycle duration=4 weeks) and end of treatment. Observed on treatment up to 12 cycles (48 weeks).
48-weeks Overall Response Rate (ORR) [Cohort A]	48-week ORR defined as the proportion of participants achieving BOS complete response (CR) or partial response (PR) based on change in FEV1 measurement per criteria of the 2014 NIH Consensus Conference.	Evaluated every 8 weeks, up to 48 weeks.
48-week Progression Rate [Cohort B]	48-week progression rate is defined as the proportion of participants experiencing BOS progression based on change in FEV1 measurement per criteria of the 2014 NIH Consensus Conference.	Evaluated every 8 weeks, up to 48 weeks.

Collaborators and Investigators

• Sponsor: Dana-Farber Cancer Institute
• Collaborators: Sanofi; National Heart, Lung, and Blood Institute (NHLBI)
• Investigators: Principal Investigator: Corey Cutler, MD, MPH, Dana-Farber Cancer Institute

Study record dates

Study Major Dates

• Study Start (Actual): May 31, 2024
• Primary Completion (Estimated): June 30, 2027
• Study Completion (Estimated): December 31, 2027

Study Registration Dates

• First Submitted: June 3, 2023
• First Submitted That Met QC Criteria: June 19, 2023
• First Posted (Actual): June 28, 2023

Study Record Updates

• Last Update Posted (Actual): February 11, 2026
• Last Update Submitted That Met QC Criteria: February 9, 2026
• Last Verified: February 1, 2026

More Information

Terms related to this study

• Keywords: Lung Disease; HSCT; Bronchiolitis Obliterans Syndrome; Bronchiolitis Obliterans; Allogeneic hematopoietic stem cell transplant; Chronic Graft Versus Host Disease
• Additional Relevant MeSH Terms: Organizing Pneumonia; Immune System Diseases; Respiratory Tract Diseases; Bronchial Diseases; Lung Diseases, Obstructive; Bronchiolitis; Bronchitis; Graft vs Host Disease; Bronchiolitis Obliterans Syndrome; Lung Diseases; Bronchiolitis Obliterans; Organic Chemicals; Polycyclic Compounds; Pregnadienes; Pregnanes; Steroids; Fused-Ring Compounds; Macrolides; Lactones; Pregnadienediols; Androstadienes; Androstenes; Androstanes; Erythromycin; Polyketides; Fluticasone; Prednisone; Azithromycin; belumosudil; KD025; montelukast; acetamide
• Other Study ID Numbers: 23-043

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: The Dana-Farber / Harvard Cancer Center encourages and supports the responsible and ethical sharing of data from clinical trials. De-identified participant data from the final research dataset used in the published manuscript may only be shared under the terms of a Data Use Agreement. Requests may be directed to: [contact information for Sponsor Investigator or designee]. The protocol and statistical analysis plan will be made available on Clinicaltrials.gov only as required by federal regulation or as a condition of awards and agreements supporting the research.
• IPD Sharing Time Frame: Data can be shared no earlier than 1 year following the date of publication
• IPD Sharing Access Criteria: Contact the Belfer Office for Dana-Farber Innovations (BODFI) at innovation@dfci.harvard.edu
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: Yes