Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Randomized, Double-Blind, Placebo-Controlled, Parallel Study to Evaluate Safety, Pharmacokinetics (PK) and Pharmacodynamics(PD) of FDL169 in Cystic Fibrosis (CF) Subjects Homozygous for the F508del-CFTR Mutation
Brief Summary: This is a multicenter, randomized, placebo-controlled, dose-escalation study. Enrollment is planned to occur at approximately 14 global sites. Approximately 24 subjects with CF.


Options:
A: Inclusion Criteria:

* Confirmed diagnosis of CF
* Homozygous for the F508del CFTR mutation
* Forced expiratory volume in 1 second (FEV1) greater than or equal to (\>=) 40 percent (%) and less than or equal to (=\<) 90% of predicted normal for age, sex, and height
* Willing to remain on a stable CF medication regimen through Week 24 or, if applicable, the Safety Follow up Visit

Exclusion Criteria:

* An acute upper or lower respiratory infection, pulmonary exacerbation, or changes in therapy (including antibiotics) for pulmonary disease within 4 weeks before first dose of study drug
* History of solid organ or hematological transplantation
* History of alcohol or drug abuse in the past year
* Ongoing or prior participation in an investigational drug study (including studies investigating lumacaftor and/or ivacaftor) within 30 days of screening.
* Use of strong inhibitors, moderate inducers, or strong inducers of Cytochrome P450 3A (CYP3A) within 14 days before Day 1 of dosing
B: Key Inclusion Criteria:

* Completed study drug treatment in parent study (VX18-445-109); or had study drug interruption(s) in parent study but completed study visits up to the last scheduled visit of the Treatment Period in the parent study

Key Exclusion Criteria:

* History of study drug intolerance in parent study

Other protocol defined Inclusion/Exclusion criteria may apply.
C: Inclusion Criteria:

* Male or female subjects with a confirmed diagnosis of CF defined as a sweat chloride value ≥60 mmol/L by quantitative pilocarpine iontophoresis or two CF-causing mutations,documented in the subject's medical record or confirmed at screening.
* Age 18 and above on the date of informed consent.
* Weight ≥40 kg.
* Homozygous for the F508del-CFTR mutation. Genotyping to be confirmed at screening.
* Ability to perform a valid, reproducible spirometry test with demonstration of a forced expiratory volume in 1 sec (FEV1) \>40% of predicted normal for age, sex and height.
* Screening laboratory tests with no clinically significant abnormalities that would interfere with the study assessments (as judged by the Investigator).
* Subjects who are sexually active must agree to follow the study's contraception requirements.

Exclusion Criteria:

* An acute upper or lower respiratory tract infection, pulmonary exacerbation, or changes in therapy for pulmonary disease within 4 weeks prior to Day 1.
* Major complications of lung disease (including massive hemoptysis, pneumothorax, or pleural effusion) within 8 weeks prior to screening.
* Impaired renal function or known portal hypertension.
* History of prolonged QT and/or QTcF (Fridericia's correction) interval (\>450 msec) or QTcF \>450 msec at Screening.
* History of solid organ or hematological transplantation.
* History of alcohol abuse or drug addiction (including cannabis, cocaine and opiates) during the past year, (as judged by the Investigator).
* Use of ivacaftor or lumacaftor, within 4 weeks of Day 1
* Any change (initiation, change in type of drug, dose modification, schedule modification, interruption, discontinuation, or re-initiation) in a chronic treatment/prophylaxis regimen for CF or for CF-related conditions within 4 weeks prior to Day 1.
* Ongoing immunosuppressive therapy (including systemic corticosteroids).
* Hemoglobin \<10 g/dL.
* Abnormal liver function, at screening.
* Abnormal renal function at screening.
* Ongoing participation in another clinical study or prior participation without appropriate washout (minimum of 10 half- lives or 30 days, whichever is longer) prior to Screening visit.
D: Inclusion Criteria:

* Completed study drug treatment in a parent study i.e.VX17-445-102 (NCT03525444) and VX17-445-103 (NCT03525548); or had study drug interruption(s) in a parent study but completed study visits up to the last scheduled visit of the Treatment Period in the parent study.

Exclusion Criteria:

* History of drug intolerance in a parent study that would pose an additional risk to the subject in the opinion of the investigator.
* Current participation in an investigational drug trial (other than a parent study)

Other protocol defined Inclusion/Exclusion criteria may apply.

Answer: C