A Two-Part Study to Evaluate the Efficacy, Safety, Tolerability and Pharmacokinetics of Repeat Doses of Inhaled ETD001 in People With Cystic Fibrosis

Inclusion criteria

• Male & female ≥ 18 years of age, who fit one of the following criteria:

Women of childbearing potential using permitted contraception a minimum of 28 days before dosing until completion of the final follow up visit; Women of non-childbearing potential; Men using contraception from the time of the first dose, until completion of the final follow up visit;

• Confirmed diagnosis of CF
• FEV1 ≥ 40% and ≤ 90% of predicted normal for age, gender, and height
• Able to reproducibly perform spirometry manoeuvres
• Clinically stable CF lung disease
• Routine CF therapy has not changed within 28 days prior to screening.
• Provided written informed consent.
• Body mass index (BMI) > 16 and < 30 kg/m2

Exclusion criteria

• Abnormal liver function
• Abnormal renal function
• History of solid organ transplant
• Chest x-ray within the past 12 months with abnormalities suggesting unstable pulmonary disease other than CF
• Received CFTR modulator therapy in the 60 days before screening
• Changes in bronchodilator, corticosteroid or other anti-inflammatory medications 14 days before screening
• Unable to withhold use of long-acting bronchodilators 24 hours or short-acting bronchodilators 6 hours before spirometry assessments
• Unable to withhold use of anti-cholinergics within 24 hours of spirometry
• Started dornase alfa, hypertonic saline, or other airway clearing therapy less than 28 days before screening
• Using inhaled antibiotics for less than 2 complete cycles and unable to complete the entire study during the off or on cycle.
• Changes in inhaled or oral antibiotic use within 14 days of screening
• Taking oral corticosteroids in excess of 10 mg/day or 20 mg every other day within 14 days of screening
• Use of diuretics, or renin-angiotensin aldosterone system antihypertensive drugs , drospirenone, or trimethoprim in the 28 days before screening
• Presence of co-morbidities and medical history in the opinion of the investigator, may pose additional risk by participating in the study, or may confound the results of the study