Safety and Pharmacokinetic Study of Lumacaftor/Ivacaftor in Participants 1 to Less Than 2 Years of Age With Cystic Fibrosis, Homozygous for F508del

This study will evaluate the safety and pharmacokinetics (PK) of lumacaftor (LUM) and ivacaftor (IVA) in participants 1 to less than 2 years of age with cystic fibrosis (CF), homozygous for F508del (F/F).

Key Inclusion Criteria:

* Participants will be 1 to less than 2 years of age on day 1 of the relevant part of the study
* Homozygous for F508del (F/F)

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 participants
* Solid organ or hematological transplantation

Other protocol defined Inclusion/Exclusion criteria may apply.