Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase 2, Multicenter, Double-Blinded, Placebo Controlled Study to Evaluate Safety, Efficacy, Pharmacokinetics, and Pharmacodynamics of VX-661 Monotherapy and VX-661/Ivacaftor Cotherapy in Subjects With Cystic Fibrosis, Homozygous or Heterozygous for the F508del-CFTR Mutation
Brief Summary: The purpose of this study is to evaluate the safety, efficacy, pharmacokinetics (PK), and pharmacodynamics (PD) effects of VX-661 alone and when coadministered with ivacaftor in participants with cystic fibrosis (CF) who are homozygous or heterozygous for the F508del-CFTR mutation.


Options:
A: Inclusion Criteria:

* Male or female with confirmed diagnosis of CF
* Must have the F508del-CFTR gene mutation in both alleles (Groups 1, 2, 3, 4, 5, 6). Group 7 participants must have the F508del-CFTR mutation on 1 allele, and gating mutation G551D on the second allele and have been on their physician prescribed 150 mg KalydecoTM q12h (commercially available ivacaftor) for at least 28 days at the Screening Visit.
* Forced expiratory volume in 1 second(FEV1) 40% to 90% (inclusive) of predicted normal for age, gender, and height (Knudson standards) at screening
* Weight \>40 kg and BMI \>18.5
* Participants of child-bearing potential and who are sexually active must meet the contraception requirements.

Exclusion Criteria:

* History of any illness that, in the opinion of the investigator, might confound the results of the study or pose an additional risk in administering study drug to the participant.
* An acute upper or lower respiratory infection, pulmonary exacerbation, or changes in therapy (including antibiotics) for pulmonary disease within 4 weeks before Study Day 1.
* History of solid organ or hematological transplantation
* Participation in a clinical study involving administration of either an investigational or a marketed drug within 30 days or 5 terminal half-lives (whichever is longer) before screening
* History of alcohol, medication, or illicit drug abuse within 1 year prior to screening
* Pregnant, breast-feeding, or not willing to follow contraception requirements
B: Inclusion Criteria:

* Subject voluntarily agrees to participate in this study; signs an IRB-approved informed consent
* Subject is healthy as determined by the screening medical evaluation (including but not limited to medical history, physical examination and clinical laboratory evaluations)
* Subject is Caucasian
* Female subject must be of non-childbearing potential or post-menopausal
* Male subject must agree to use a condom with spermicide and refrain from sperm donation from Day -1 until 30 days post last dose or have a vasectomy at least 6 months prior to screening
* Subject is a non-smoker
* Subject has a body weight \> 45 kg and BMI between 18 and 32 kg/m2
* Subject has no clinically significant vital signs finding at screening or Day -1, per the investigator's judgment
* Subject has no clinically significant abnormal findings in 12-lead ECG , per the investigator's judgment, at screening

Exclusion Criteria:

* Subject has clinically significant history or evidence of cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, neurological, immunological, or psychiatric disorder(s)
* Subject has abnormal 12-lead ECG at screening per protocol
* Subject has any disorder that would interfere with the absorption, distribution, metabolism or excretion of drugs
* Subject has any concurrent disease or condition that, in the opinion of the investigator, would make the subject unsuitable for participation in the clinical study
* Subject is a current alcohol abuser and/or has a history of illicit drug abuse within 1 year prior to dosing
* Subject has a positive screening test for Hepatitis B surface antigen, Hepatitis C antibody, or human immunodeficiency virus (HIV) antibody
* Subject is unwilling to refrain from consumption of coffee and caffeine-containing foods and beverages from Day -1 until discharge on Day 14
* Subject is unwilling to abstain from using alcohol beverages from Day -1 until discharge on Day 14
* Subject has donated blood (\> 500 mL) or blood products within 56 days prior to Day -1
* Subject has used over-the-counter (OTC) medications (including vitamins) from Day -7, or prescription medications, or herbal remedies from Day -14 until end-of-study follow-up call. By exception, acetaminophen ≤ 1000 mg/day is permitted except within 48 hours prior to Day -1 and hormone replacement therapy (HRT) is allowed throughout the study
* Subject has used an investigational drug within 30 days prior to Day 1 dosing
* Subject has a history of bleeding disorders
C: Inclusion Criteria:

* Male or female participants with confirmed diagnosis of CF
* Must have the F508del-CFTR mutation on at least 1 allele.
* FEV1 greater than equal (\>=) 40% of predicted normal for age, gender, and height (Knudson standards)(Cohort 1, 2, and 3); FEV1 40-90% of predicted normal for age, gender, and height (Hankinson standards (Cohort 4)
* Participant of child-bearing potential and who are sexually active must meet the contraception requirements

Exclusion Criteria:

* History of any illness or condition that, in the opinion of the investigator might confound the results of the study or pose an additional risk in administering study drug to the participant (e.g., cirrhosis with portal hypertension).
* An acute illness including acute upper or lower respiratory infection, pulmonary exacerbation or changes in therapy (including antibiotics) for pulmonary disease within 14 days (Cohort 1, 2, and 3) or 28 days (Cohort 4) before receiving the first dose of study drug.
* History of solid organ or hematological transplantation.
* History of alcohol abuse or drug addiction in the past year, including cannabis, cocaine, and opiates.
* Ongoing participation in another therapeutic clinical study, or prior participation in an investigational drug study without appropriate washout
* Pregnant or nursing females; females of childbearing potential who are unwilling or unable to use an acceptable method of non-hormonal contraception
* Participants enrolled in Cohort 1 or Cohort 2 will not be eligible for Cohort 3
* Ongoing or prior participation in an investigational drug study within 30 days of the Screening Visit
* Heterozygous participants who participated in Cohort 2 and meet the eligibility criteria for Cohort 4 may participate in Cohort 4
* Evidence of lens opacity or cataract as determined by the ophthalmologic examination (Cohort 4 only)
D: Inclusion Criteria:

* Heterozygous for F508del-CFTR and a second allele with a CFTR mutation predicted to have residual function
* 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 during screening
* Sweat chloride value ≥60 millimole per liter (mmol/L) during screening OR as documented in the participant's medical record
* Stable CF disease as judged by the investigator

Exclusion Criteria:

* History of any comorbidity that, in the opinion of the investigator, might confound the results of the study or pose an additional risk in administering study drug to the participant
* An acute upper or lower respiratory infection, pulmonary exacerbation
* History of solid organ or hematological transplantation
* Ongoing or prior participation in an investigational drug study (including studies investigating VX-661, lumacaftor \[VX-809\], and/or ivacaftor) within 30 days of screening
* Pregnant and nursing females
* Sexually active participants of reproductive potential who are not willing to follow the contraception requirements

Answer: A