Safety, Tolerability and Efficacy of S-1226 in Cystic Fibrosis


This is a single center, open label, Phase IIa, multiple-ascending dose study in which subjects with mild to moderate Cystic Fibrosis (n≤12) will be enrolled. The safety and tolerability of S-1226 composed of PFOB with ascending doses of carbon dioxide (4%, 8%, and 12% CO2) administered up to three successive doses, twice daily in subjects with Cystic Fibrosis will be evaluated.

Full Title of Study: “A Phase IIa Open Label Study to Evaluate the Safety, Tolerability and Efficacy of S-1226 Administered by Nebulization in Subjects With Mild to Moderate Cystic Fibrosis”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Non-Randomized
    • Intervention Model: Sequential Assignment
    • Primary Purpose: Treatment
    • Masking: None (Open Label)
  • Study Primary Completion Date: April 2020

Detailed Description

This is a single center, open label, Phase IIa, multiple-ascending dose study in which subjects with mild to moderate Cystic Fibrosis (n≤12) will be enrolled. The study will consist of a screening period, a run-in and two dosing and evaluation periods (with a minimum two-day break in between) and a follow-up period. The dosing and evaluation period of the study is divided into two consecutive components: 1. Dose escalation study – This segment of the treatment period is designed to assess the safety and tolerability of escalating doses of S-1226 (4%, 8% and 12%) in those with mild-moderate CF 2. Daily dosing study – This segment of the treatment period is designed to assess the short term (5 day) safety and tolerability of twice daily administration of a fixed dose of S-1226 in subjects with mild-moderate CF. The primary aim of this study of S-1226 is to capture information to inform follow-up S-1226 clinical studies in CF. Important in this regard will be data on safety, tolerability, dosing and efficacy. Specifically, regarding efficacy, the investigators want to examine for optimal dose ranging and magnitude of the effect to determine the power calculations for any follow-up studies and to determine which outcome measures best reflect the effects of the drug. Because the study is investigational in nature, it will be un-blinded and information will be analyzed as it is collected. During the screening and the run-in period, the subjects will have safety assessments and all eligibility criteria confirmed. The run-in period involves meeting with the study subjects 1 – 2 weeks prior to the start of the treatment for a physical exam, concomitant medication review, spirometry and information regarding the study. The consent process will also take place at this stage. The dose escalation period will include 3 days of twice daily treatment of the study drug with a washout period in between. The dose of CO2 in S-1226 will be sequentially escalated for the particular subject from the starting dose of 4% CO2. Planned subsequent dose levels are 8% and 12% CO2, although doses may be adjusted within this range based on safety and tolerability data from the completed dosing days. Subjects will not be dosed with a higher CO2 level until drug administration of the preceding dose level has been completed and safety data reviewed by the Safety Committee and a decision taken to proceed or not with the next sequential dose level. There will be a washout period between the dose escalation and the daily dosing study. The daily dosing study will include 5 days of twice daily treatment of the study drug at the dose outlined following the algorithm given in Figure 2 based on the results of the dose escalation study. Each treatment period consists of study drug administration (three doses in 2-minute intervals) followed by airway clearance maneuver. Lung function tests will be performed before and after the treatment. The follow-up phase will occur 10-14 days after completion of the final dose. This will involve a clinical exam, spirometry and completion of CFQ-R.


  • Drug: S-1226
    • The drug product S-1226 has two components delivered by inhalation. It is a mixture of perfluorooctylbromide (PFOB) nebulized with a medical gas mixture containing CO2. The PFOB component remains the same but the medical gas component contains 4%, 8% or 12% CO2.

Arms, Groups and Cohorts

  • Experimental: Dose Escalation Study
    • Subjects will receive up to three inhaled doses of S- 1226. Each dose will be administered over a 2-minute treatment period (with a minimum 2-minute break between treatments) with a nebulizer as follows. Three S-1226 formulations will be tested sequentially: S-1226(4%) is composed of 3 mL PFOB and 4% CO2 S-1226(8%) is composed of 3 mL PFOB and 8% CO2 S-1226(12%) is composed of 3 mL PFOB and 12% CO2 Each formulation will be administered by inhalation for a period of 2 minutes.The nebulizer will be filled with 3 mL of PFOB. The nebulizer is connected to a compressed medical gas mixture consisting of either 4%, 8% or 12%, CO2. A driving pressure of 20 psi will be used, producing a gas flow rate of 9 L/min.
  • Experimental: Daily Dosing Study
    • Eligible subjects will receive S-1226 twice daily for 5 consecutive days. Subjects will receive up to three doses of S-1226 in the morning and afternoon, administered over three 2-minute periods with a Circulaire nebulizer, filled with one of the dosages outlined below, depending on the safety and tolerability data gathered from the dose escalation study for that particular subject. S-1226(4%) is composed of 3 mL PFOB and 4% CO2 S-1226(8%) is composed of 3 mL PFOB and 8% CO2 S-1226(12%) is composed of 3 mL PFOB and 12% CO2

Clinical Trial Outcome Measures

Primary Measures

  • Treatment-emergent adverse events
    • Time Frame: 60 minutes
    • The number and percent of treatment emergent adverse events will be monitored, recorded and graded for severity and assigned attribution. The severity will be assessed in the following manner: Mild: Awareness of signs or symptoms, but are easily tolerated and are of minor irritant type, causing no limitations of usual activities. Signs or symptoms may require minor action or additional therapy. Moderate: Discomfort severe enough to cause some limitations of usual activities and may require action or additional therapy. Severe: Incapacitating with inability to carry out usual activities and requires specific action and/or medical attention. Note: the term severe is not the same as “serious”, which is based on subject/event outcome or action criteria usually associated with events that pose a threat to a subject’s life or functioning. Seriousness (not severity) serves as a guide for defining regulatory reporting obligations.

Secondary Measures

  • Change from baseline in percent of predicted forced expiratory volume in 1 Second
    • Time Frame: 60 minutes
    • Change from baseline in percent of predicted forced expiratory volume in 1 Second (FEV1) will be calculated by measuring FEV1 at baseline and after treatment. FEV1 is defined as the volume of air exhaled from the lungs in the first second of a forced expiration.
  • Change from baseline in the respiratory domain of Cystic Fibrosis Questionnaire -Revised
    • Time Frame: Up to 4 weeks
    • Change from baseline in respiratory symptoms scores (subscale) of the Cystic Fibrosis Questionnaire -Revised (CFQ-R) will be measured. CFQ-R is a validated, disease specific, patient reported outcome measure used to evaluate the impact of CF on overall health, daily life, and perceived well-being and symptoms. This sub-scale ranges from scores of 0-100, with higher values representing a better outcome.

Participating in This Clinical Trial

Inclusion Criteria

  • Confirmed diagnosis of Cystic Fibrosis by sweat chloride concentration over 60 mosm/L and/or genotype analysis identifying two disease causing mutations – Male or Female over the age of 14 – Followed in CF clinic at Foothills Hospital or Alberta Children's Hospital – Known lung involvement 1. Recommended airway clearance daily or twice daily 2. FEV1, % predicted, between 40-80% 3. Evidence of Cystic Fibrosis lung involvement on Imaging, if available – Competent at providing reliable and accurate pulmonary function studies – Clinically stable – no pulmonary exacerbation of CF for which the patient has been hospitalized or received intravenous antibiotics for 4 weeks, no change in frequency of airway clearance Exclusion Criteria:
  • Gross Hemoptysis in previous 4 weeks – Pneumothorax in previous 4 weeks – Pregnancy or of child bearing age without adequate contraception – Inability to produce acceptable and reproducible pulmonary function studies – Evidence of elevated PaCO2 in recent 6 months – Inability to perform airway clearance twice a day for the duration of the study – History of anxiety/panic disorders – Breast-feeding subject. – Positive pregnancy test at screening. – Subject, who in the opinion of the Investigator, is mentally or emotionally unsuitable to participate, or unable/unwilling to comply with the study assessments.
  • Gender Eligibility: All

    Minimum Age: 14 Years

    Maximum Age: 50 Years

    Are Healthy Volunteers Accepted: No

    Investigator Details

    • Lead Sponsor
      • SolAeroMed Inc.
    • Provider of Information About this Clinical Study
      • Sponsor
    • Overall Official(s)
      • Mark Montgomery, MD, Principal Investigator, University of Calgary
    • Overall Contact(s)
      • John Dennis, Phd, 403-689-5989,


    Swystun V, Green FHY, Dennis JH, Rampakakis E, Lalli G, Fadayomi M, Chiu A, Shrestha G, El Shahat SG, Nelson DE, El Mays TY, Pieron CA, Leigh R. A phase IIa proof-of-concept, placebo-controlled, randomized, double-blind, crossover, single-dose clinical trial of a new class of bronchodilator for acute asthma. Trials. 2018 Jun 18;19(1):321. doi: 10.1186/s13063-018-2720-6.

    Green FH, Leigh R, Fadayomi M, Lalli G, Chiu A, Shrestha G, ElShahat SG, Nelson DE, El Mays TY, Pieron CA, Dennis JH. A phase I, placebo-controlled, randomized, double-blind, single ascending dose-ranging study to evaluate the safety and tolerability of a novel biophysical bronchodilator (S-1226) administered by nebulization in healthy volunteers. Trials. 2016 Jul 28;17:361. doi: 10.1186/s13063-016-1489-8.

    El Mays TY, Choudhury P, Leigh R, Koumoundouros E, Van der Velden J, Shrestha G, Pieron CA, Dennis JH, Green FH, Snibson KJ. Nebulized perflubron and carbon dioxide rapidly dilate constricted airways in an ovine model of allergic asthma. Respir Res. 2014 Sep 16;15:98. doi: 10.1186/s12931-014-0098-x.

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