A Study to Explore the Impact of Lumacaftor/Ivacaftor on Disease Progression in Subjects Aged 2 Through 5 Years With Cystic Fibrosis, Homozygous for F508del

An Exploratory Phase 2, 2-part, Randomized, Double-blind, Placebo-controlled Study With a Long-term, Open-label Period to Explore the Impact of Lumacaftor/Ivacaftor on Disease Progression in Subjects Aged 2 Through 5 Years With Cystic Fibrosis, Homozygous for F508del

This study will explore the impact of lumacaftor/ivacaftor (LUM/IVA) on disease progression in subjects aged 2 through 5 years with cystic fibrosis (CF), homozygous for F508del (F/F).

Key Inclusion Criteria:

• Subjects with confirmed diagnosis of CF.
• Homozygous for F508del (F/F).
• Subjects who weigh ≥8 kg without shoes and wearing light clothing at the Screening Visit.

Key Exclusion Criteria:

• Any clinically significant laboratory abnormalities at the Screening Visit that would interfere with the study assessments or pose an undue risk for the subject.
• Solid organ or hematological transplantation.
• History of any illness or comorbidity reviewed at the Screening Visit that, in the opinion of the investigator, might confound the results of the study.

Other protocol defined Inclusion/Exclusion criteria may apply.