LAM-001 in Lung Transplant Recipients With Bronchiolitis Obliterans Syndrome. (INSPO-BOS)

A Randomized, Placebo-controlled Phase 2 Study to Demonstrate the Safety and Efficacy of the Addition of LAM-001 to Standard Immunosuppression Therapy for Chronic Lung Allograft Dysfunction (BOS).

The goal of this clinical trial is to learn about the safety and effectiveness of LAM-001 in patients who have developed bronchiolitis obliterans syndrome (BOS), a form of chronic rejection, after lung transplantation.

The main questions it aims to answer are:

• Is LAM-001 safe in these patients?
• Is LAM-001 effective in slowing BOS progression?

Participants will:

• Be randomly assigned to inhale either LAM-001 or placebo (a look-alike substance that contains no active drug) daily for 48 weeks
• Attend 10 study visits (mixture of in-person and telehealth) over the 48 week period
• Undergo pulmonary function testing, bronchoscopy, lab testing, and physical examination
• Submit weekly home spirometry monitoring

Researchers will compare participants assigned to LAM-001 versus placebo to see if LAM-001 is safely tolerated and to assess the effectiveness of LAM-001 on slowing BOS progression.

Study Overview

• Status: Recruiting
• Conditions: Lung Transplantation; Chronic Lung Allograft Dysfunction; Bronchiolitis Obliterans Syndrome
• Intervention / Treatment: Drug: LAM-001; Drug: Placebo

Detailed Description

Chronic rejection, commonly denoted as bronchiolitis obliterans (BO), obliterative bronchiolitis (OB), or bronchiolitis obliterans syndrome (BOS), is the leading cause of death beyond the first year after lung transplantation. Whereas the development of BOS is rare within the first year after lung transplantation, annual increments of approximately 10% are recorded in subsequent years, resulting in a cumulative incidence range of 40-50% within the first five years and 70-80% within 10 years of transplantation.

No current effective treatment for BOS exists. BOS represents the leading cause of morbidity and mortality after lung transplantation, limiting 5-year survival to well below other solid organ transplants. BOS is characterized by an inexorable lung function decline despite currently available immunomodulatory treatments. Sirolimus has been shown to block T-cell proliferative effects induced by cytokines, alloantigens, and mitogens in a dose-dependent manner(4, 5). Oral sirolimus has been shown in small studies to have a beneficial impact on rapidly progressive BOS; however, administration in this patient population has been challenged by a high degree of intolerance with the side effects. The development of LAM-001 for lung transplant related BOS, conceptually a T-cell driven process against transplanted alloantigen, is based on the principal hypothesis that administration of a sirolimus dose to the rejecting lung allograft(s) by inhalation will result in improved efficacy by depositing higher drug concentrations directly within the allograft by inhalation than would be achieved by oral administration due to systemic toxicities associated with oral sirolimus. Because of known reduced systemic bioavailability of LAM-001 compared to oral sirolimus dosing, amelioration of the substantial adverse event profile compared to oral drug is expected. LAM-001 is also expected to reduce serious complication risks by obviating requirements for maintenance and augmented immune drugs used to treat BOS.

• Study Type: Interventional
• Enrollment (Estimated): 30
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Steven Hays, MD; Phone Number: 415-336-4141; Email: steven.hays@ucsf.edu

Study Locations

• United States
  • California
    • San Francisco, California, United States, 94143
      • Recruiting
      • University of California, San Francisco
      • Contact: Steven Hays, MD; Phone Number: 415-353-4141; Email: steven.hays@ucsf.edu
      • Principal Investigator: Steven Hays, MD
      • Principal Investigator: Julia Maheshwari, MD

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Age > 18 years old
• Recipient of a double pulmonary allograft at least 12 months before study entry

• Subjects with clinically diagnosed CLAD-BOS phenotype (all 3 required)

  • BOS defined as screening FEV1 between 85-51% of the baseline as defined by the 2 highest FEV1 measures at least 3 weeks apart.
  • Diagnosis within 12 months of screening visit.
  • FEV1 decline is persistent as defined by decline sustained for > 30 days.
• Currently receiving Standard Immunosuppression. This is defined as a combination of 3 medications including Prednisone, Mycophenolate or Azathioprine, and Tacrolimus or Cyclosporine. The dosing should be stable for 4 weeks prior to screening.
• Absence of oral sirolimus or everolimus treatment for at least 4 weeks prior to screening based on the half-life and resolution of the tissue effects
• Stable enough to enable routine post-transplant bronchoscopy with BAL and biopsy when indicated
• Capable of understanding the purposes and risks of the study
• Written informed consent (and assent when applicable) obtained from subject or subject's legal representative and ability for subject to comply with the requirements of the study.
• Women of childbearing potential must have a negative serum pregnancy test within 7 days prior to study entry
• Women of childbearing potential if sexually active must agree to using highly effective contraception during study and for 90 days after discontinuation of study treatment
• Women of childbearing potential must refrain from breast feeding or donating eggs for the duration of the study and for 90 days after the last dose of study treatment
• Male participants must agree to use a condom during sexual contact with a female of childbearing potential while participating in the study and for 90 days following discontinuation of investigational product use
• Male participants must refrain from donating sperm for the duration of the study and for 90 days after the last dose of study treatment

Exclusion Criteria:

• Pregnant, breastfeeding, or unwilling to practice birth control during participation in the study.
• Presence of a condition or abnormality that in the opinion of the Investigator would compromise the safety of the patient or the quality of the data.
• Patients with re-transplantation or currently listed for re-transplantation
• Patients with confirmed other causes for loss of lung function, such as acute infection, acute rejection, restrictive allograft syndrome (CLAD - RAS phenotype, see Protocol Specific Definition), etc.
• Patients with acute antibody-mediated rejection at Screening. In this context, clinically stable patients (as judged by the Investigator) with detectable donor-specific antibodies (DSA) levels at the Screening Visit are eligible for the study
• Active acute bacterial, viral, or fungal infection that has not successfully resolved in at least 4 weeks prior to the Screening Visit. Patients with chronic infection or colonization who are clinically stable as per judgement of the investigator are eligible.
• Mechanical ventilation within 12 weeks prior to the randomization
• Patient has baseline resting oxygen saturation of < 89% on room air or use of supplemental oxygen at rest at screening
• Evidence of functional airway stenosis (i.e., bronchomalacia/ tracheomalacia, airway stents, or airways requiring balloon dilatations to maintain patency) with onset after the initial diagnosis of BOS and ongoing at Screening and/or Baseline Visit
• Known hypersensitivity to sirolimus or everolimus
• Currently enrolled in another investigational trial for obstructive chronic lung allograft dysfunction (BOS)
• Patients with chronic renal failure, defined as serum creatinine > 2.5 mg/dL at screening, or requiring chronic dialysis
• Patients with liver disease and serum bilirubin > 3-fold upper limit of normal range or transaminases > 2.5 upper limit of normal range
• Patients with active malignancy within the previous 2 years, including post-transplant lymphoproliferative disorder, except for treated, localized basal and squamous cell carcinomas
• Any history of malignancy likely to result in significant disability or likely to require significant medical or surgical intervention within the next 6 months. This does not include minor surgical procedures for localized skin cancer.
• History of severe allergic reaction to lactose (patients with lactose intolerance are eligible)
• Patients with uncontrolled hypertension

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: Placebo	Drug: Placebo; Placebo administered via dry powder inhaler
Experimental: LAM-001	Drug: LAM-001; LAM-001 administered via dry powder inhaler

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
% change in FEV1 from baseline	Patient's % change in FEV1 from baseline at 48 weeks or termination of treatment, whichever is earlier	48 week

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Absolute change in FEV1	Change in FEV1 from baseline	48 weeks
Change in the rate of progression in FEV1	Change in rate of progression in FEV1 in the time period (up to 12 months) prior to enrollment in the clinical trial compared to rate of progression from enrollment to 48 weeks (or termination of treatment, whichever occurs first) as measured by change in FEV1/month (measured in L and as % of baseline).	48 weeks
Time to Progression Free Survival (PFS), Level 1	Time to Progression Free Survival (PFS) Level 1, defined as the earliest of the following: Absolute decrease in the FEV1 from baseline of >10%; Death from respiratory failure or re-transplantation	48 weeks

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Quality of Life	Change in Quality of Life as measured by St. George's Respiratory Questionnaire -COPD (SGRQ-C). The range of scores is 0-100, with the higher scores representing more limitation in quality of life.	48 weeks
Change in six-minute walk distance (6MWD)	Change in 6MWD from baseline	48 weeks
CLAD signature gene profiling	Utilizing the endobronchial brush, we will quantify a metagene, or normalized sum of gene expression, from our previously published airway inflammation gene set, as described in our publication (PMID: 32885581). The metagene expression will be compared between randomized groups.	3 months post randomization
mTOR pathway activation	Utilizing the bronchioalveolar lavage fluid, we will quantify pS6S235/235 in lymphocytes using flow cytometry, to quantify mTORC1 activity, as previously published (PMID: 36066491). We will compare pS6S235/235 between randomized groups.	3 months post randomization
Adverse events	Incidence and severity of treatment emergent adverse events (AE) and serious adverse events (SAE).	52 weeks
Blood sirolimus levels	Measured blood sirolimus levels	Assessed pre-inhalation at in-person study visits over 48 weeks and post-inhalation at 3 months post randomization
Bronchioalveolar lavage fluid sirolimus levels	Measured bronchioalveolar lavage fluid sirolimus levels	12 weeks
Airway Hypersensitivity to Treatment	Measurement of FEV1 pre-inhalation and 4 hours following study drug inhalation to determine whether a subject has airway hyperreactivity to the study drug.	Baseline Study Visit (Week 0)
Time to Progression Free Survival (PFS), Level 2	Time to PFS level 2, defined as the earliest of the following: Absolute decrease in the FEV1 from baseline of >20%; Death from respiratory failure or retransplantation.	48 weeks
Change in FEV1/FVC ratios	Change in the FEV1/FVC ratios of patients over 48 weeks or termination of treatment, whichever comes first	48 weeks

Collaborators and Investigators

• Sponsor: Steven Hays, MD
• Collaborators: OrphAI Therapeutics
• Investigators: Principal Investigator: Steven Hays, MD, University of California, San Francisco

Publications and helpful links

General Publications

• Sehgal SN. Rapamune (RAPA, rapamycin, sirolimus): mechanism of action immunosuppressive effect results from blockade of signal transduction and inhibition of cell cycle progression. Clin Biochem. 1998 Jul;31(5):335-40. doi: 10.1016/s0009-9120(98)00045-9.
• Gillen JR, Zhao Y, Harris DA, LaPar DJ, Kron IL, Lau CL. Short-course rapamycin treatment preserves airway epithelium and protects against bronchiolitis obliterans. Ann Thorac Surg. 2013 Aug;96(2):464-72. doi: 10.1016/j.athoracsur.2013.04.068. Epub 2013 Jun 24.
• Gillen JR, Zhao Y, Harris DA, Lapar DJ, Stone ML, Fernandez LG, Kron IL, Lau CL. Rapamycin blocks fibrocyte migration and attenuates bronchiolitis obliterans in a murine model. Ann Thorac Surg. 2013 May;95(5):1768-75. doi: 10.1016/j.athoracsur.2013.02.021. Epub 2013 Apr 2.
• Zhao Y, Gillen JR, Meher AK, Burns JA, Kron IL, Lau CL. Rapamycin prevents bronchiolitis obliterans through increasing infiltration of regulatory B cells in a murine tracheal transplantation model. J Thorac Cardiovasc Surg. 2016 Feb;151(2):487-96.e3. doi: 10.1016/j.jtcvs.2015.08.116. Epub 2015 Sep 7.
• Bak S, Tischer S, Dragon A, Ravens S, Pape L, Koenecke C, Oelke M, Blasczyk R, Maecker-Kolhoff B, Eiz-Vesper B. Selective Effects of mTOR Inhibitor Sirolimus on Naive and CMV-Specific T Cells Extending Its Applicable Range Beyond Immunosuppression. Front Immunol. 2018 Dec 17;9:2953. doi: 10.3389/fimmu.2018.02953. eCollection 2018.
• Sonis S, Treister N, Chawla S, Demetri G, Haluska F. Preliminary characterization of oral lesions associated with inhibitors of mammalian target of rapamycin in cancer patients. Cancer. 2010 Jan 1;116(1):210-5. doi: 10.1002/cncr.24696.
• Boers-Doets CB, Raber-Durlacher JE, Treister NS, Epstein JB, Arends AB, Wiersma DR, Lalla RV, Logan RM, van Erp NP, Gelderblom H. Mammalian target of rapamycin inhibitor-associated stomatitis. Future Oncol. 2013 Dec;9(12):1883-92. doi: 10.2217/fon.13.141.
• Vigarios E, Epstein JB, Sibaud V. Oral mucosal changes induced by anticancer targeted therapies and immune checkpoint inhibitors. Support Care Cancer. 2017 May;25(5):1713-1739. doi: 10.1007/s00520-017-3629-4. Epub 2017 Feb 22.
• Pilotte AP, Hohos MB, Polson KM, Huftalen TM, Treister N. Managing stomatitis in patients treated with Mammalian target of rapamycin inhibitors. Clin J Oncol Nurs. 2011 Oct;15(5):E83-9. doi: 10.1188/11.CJON.E83-E89.
• de Oliveira MA, Martins E Martins F, Wang Q, Sonis S, Demetri G, George S, Butrynski J, Treister NS. Clinical presentation and management of mTOR inhibitor-associated stomatitis. Oral Oncol. 2011 Oct;47(10):998-1003. doi: 10.1016/j.oraloncology.2011.08.009. Epub 2011 Sep 3.

Study record dates

Study Major Dates

• Study Start (Actual): August 17, 2023
• Primary Completion (Estimated): December 1, 2026
• Study Completion (Estimated): December 1, 2026

Study Registration Dates

• First Submitted: June 1, 2023
• First Submitted That Met QC Criteria: August 28, 2023
• First Posted (Actual): August 31, 2023

Study Record Updates

• Last Update Posted (Actual): May 18, 2026
• Last Update Submitted That Met QC Criteria: May 13, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: Sirolimus; mTOR inhibitor; Bronchiolitis Obliterans Syndrome; CLAD; Chronic Lung Allograft Dysfunction; Lung Transplant Rejection
• Additional Relevant MeSH Terms: Organizing Pneumonia; Immune System Diseases; Respiratory Tract Diseases; Lung Diseases; Bronchial Diseases; Lung Diseases, Obstructive; Bronchiolitis Obliterans; Bronchiolitis; Bronchitis; Graft vs Host Disease; Bronchiolitis Obliterans Syndrome; Physiological Effects of Drugs; Anti-Infective Agents; Antineoplastic Agents; Immunosuppressive Agents; Immunologic Factors; Anti-Bacterial Agents; Antibiotics, Antineoplastic; Antifungal Agents; Sirolimus
• Other Study ID Numbers: LAM-001-BOS-CLN01

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: Yes
• Studies a U.S. FDA-regulated device product: No