A Study of Ataluren in Pediatric Participants With Cystic Fibrosis

Inclusion Criteria: Participants must meet all of the following conditions to be eligible for enrollment into the study:

• Diagnosis of CF based on conclusively abnormal sweat test (sweat chloride >35 milliequivalents [mEq]/liter).
• Abnormal nasal epithelial TEPD total chloride conductance (a more electrically negative value than 5 mV for Δchloride-free+isoproterenol).
• Presence of a mutation in both alleles.
• Documentation that a blood sample has been drawn for reconfirmation of the presence of a nonsense mutation in the CFTR gene.
• Age ≥6 years.
• Body weight ≥25 kg.
• FEV1 ≥40% of predicted for age, gender, and height.
• Oxygen saturation ≥92% on room air.
• Willingness of male and female participants, if not surgically sterile, to abstain from sexual intercourse or employ a barrier or medical method of contraception during the study drug administration and follow-up periods.
• Negative pregnancy test (for females of childbearing potential).
• Willingness and ability to comply with scheduled visits, drug administration plan, study procedures (including TEPD measurements, clinical laboratory tests, pulmonary function tests, and PK sampling), and study restrictions.
• Ability to provide written informed consent and/or assent.
• Evidence of signed and dated informed consent document (by the participant or a legal guardian) indicating that the participant and/or the legal guardian has been informed of all pertinent aspects of the trial.

Exclusion Criteria: The presence of any of the following conditions will exclude a participant from enrollment in the study:

• Prior exposure to ataluren.
• Prior or ongoing medical condition (for example, concomitant illness, alcoholism, drug abuse, psychiatric condition), medical history, physical findings, ECG findings, or laboratory abnormality that, in the Investigator's opinion, could adversely affect the safety of the participant, makes it unlikely that the course of treatment or follow-up would be completed, or could impair the assessment of study results.
• Ongoing acute illness including acute upper or lower respiratory infections within 2 weeks before start of study treatment.
• History of major complications of lung disease (including recent massive hemoptysis or pneumothorax) within 2 months prior to start of study treatment.
• Abnormalities on screening chest x-ray suggesting clinically significant active pulmonary disease other than CF, or new, significant abnormalities such as atelectasis or pleural effusion which may be indicative of clinically significant active pulmonary involvement secondary to CF.
• Positive hepatitis B surface antigen, hepatitis C antibody test, or human immunodeficiency virus (HIV) test.
• Hemoglobin the upper limit of normal, or serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), or gamma-glutamyl transferase (GGT) >2.0 times the upper limit of normal).
• Abnormal renal function (serum creatinine >1.5 times upper limit of normal).
• Pregnancy or breast-feeding.
• History of solid organ or hematological transplantation.
• Exposure to another investigational drug within 14 days prior to start of study treatment.
• Ongoing participation in any other therapeutic clinical trial.
• Ongoing use of thiazolidinedione peroxisome proliferator-activated receptor gamma (PPAR γ) agonists, for example, rosiglitazone (Avandia® or equivalent) or pioglitazone (Actos® or equivalent).
• Change in intranasal medications (including use of corticosteroids, cromolyn, ipratropium bromide, phenylephrine, or oxymetazoline) within 14 days prior to start of study treatment.
• Change in treatment with systemic or inhaled corticosteroids within 14 days prior to start of study treatment.
• Use of or requirement for inhaled gentamicin or amikacin within 14 days prior to start of study treatment or during study treatment.
• Requirement for systemic aminoglycoside antibiotics within 14 days prior to start of study treat