Trikafta for Patients With Non-cystic Fibrosis Bronchiectasis

Study participants with non-cystic fibrosis bronchiectasis will be given Trikafta for four weeks. The researchers will monitor clinical endpoints, quality of life, and weight. Additionally, cutaneous punch biopsy material material or blood samples from participants who agree to do this optional test will be collected to test cellular response to Trikafta.

Non-cystic fibrosis bronchiectasis (NCFBE) is a clinical syndrome characterized by abnormal dilatation of the airways, airflow obstruction, persistent cough, excessive sputum production and recurrent lung infections. In terms of pathophysiology, airway dilatation and other features are associated with impaired mucociliary clearance and failure to adequately expel bacteria and mucus secretions from the airways. These events contribute to persistent infection, inflammation, and further progressive airway damage, leading to diminished lung function and eventually may cause respiratory failure and death. The pathogenesis of NCFBE is complex, poorly understood, and is likely to vary depending on the underlying etiology and important modifying factors.

Trikafta is approved for patients with cystic fibrosis (CF) carrying at least one copy of the common F508del variant or a number of other cystic fibrosis transmembrane conductance regulator (CFTR) mutations. Trikafta is a combination of three CF drugs, elexacaftor, ivacaftor, and tezacaftor, that helps CFTR proteins work more effectively. Patients with common forms of CF typically exhibit a robust pulmonary benefit from Trikafta within several days to a few weeks of initiating treatment.

NCFBE is clinically and pathologically similar to certain features of cystic fibrosis lung disease. Patients with NCFBE are not approved for Trikafta, and do not have access to the drug. Based on a considerable body of evidence, the researchers believe: 1) cutaneous punch biopsy material and/or blood sample, differentiated to airway epithelium, can be used to identify patients with NCFBE likely to benefit from drugs such as Trikafta, and 2) many patients with NCFBE have a disease likely to exhibit significant clinical improvement when treated with a drug such as Trikafta that activates CFTR-dependent ion transport, although neither of those notions has been adequately tested or proposed previously.

This study is an open-label, single center trial of orally administered elexacaftor, tezacaftor and ivacaftor (Trikafta) that will enroll 30 patients with NCFBE. Study participants will have one known CFTR mutation and/or mildly elevated sweat chloride measurements. In this matter, the study will specifically and prospectively test induced pluripotent stem (iPS) cells taken from patients with NCFBE to determine in vitro thresholds for predicting CFTR rescue in vivo. Using iPS cells differentiated to exhibit a respiratory epithelial phenotype, this study will determine whether the cells can be used to predict FEV1 response among individuals with NCFBE who receive Trikafta.

Eligibility Criteria:
Inclusion Criteria:

* Provision of signed and dated informed consent form
* Stated willingness to comply with all study procedures and availability for the duration of the study
* Radiologic and other clinical evidence leading to a diagnosis of NCFBE
* 1 CF-causing mutation and/or sweat chloride measurement ≥ 30 mEq/L and \< 60 mEq/L
* Able to perform spirometry meeting American Thoracic Society (ATS) criteria for acceptability and repeatability, and FEV1 40-90% predicted
* Clinically stable in the past 4 weeks with no evidence of bronchiectasis exacerbation
* Willingness to use at least one form of acceptable birth control including abstinence or condom with spermicide. This will include birth control for at least one month prior to screening and agreement to use such a method during study participation for an additional four weeks after the last administration of Study Drug
* Ability to take Trikafta
* Agreement to adhere to all current medical therapies as designated by the study physician

Exclusion Criteria:

* Diagnosis of cystic fibrosis
* Documented history of drug or alcohol abuse within the last year
* Pulmonary exacerbation or changes in therapy for pulmonary disease in the 4 weeks prior to screening
* Listed for lung or liver transplant at the time of screening
* Cirrhosis or elevated liver transaminases \> 3 times the upper limit of normal (ULN)
* Pregnant or breastfeeding
* Inhibitors or inducers of CYP3A4, including certain herbal medications and grapefruit/grapefruit juice, or other medicines known to negatively influence Trikafta administration
* History of solid organ transplant
* Active therapy for non-tuberculosis mycobacterial infection or any plan to initiate non-tuberculosis mycobacterial therapies during the study period
* Known allergy to Trikafta
* Treatment in the last 6 months with an approved CFTR modulator
* Any other condition that in the opinion of the lead investigators might confound results of the study or pose an additional risk from administering Study Drug
* Treatment with another investigational drug or other intervention within one month prior to enrollment, throughout the duration of study participation, and for an additional four weeks following final drug administration
* Evidence of cataract/lens opacity determined to be clinically significant by an ophthalmologist at or within 3 months prior to the Screening Visit