A study to learn more about a combination of CFTR modulator medicines in people with Cystic Fibrosis (VX 18 445 104)

A Phase 3, Randomized, Double-blind, Controlled Study Evaluating the Efficacy and Safety of VX-445 Combination Therapy in Subjects With Cystic Fibrosis Who Are Heterozygous for the F508del Mutation and a Gating or Residual Function Mutation (F/G and F/RF Genotypes)

This study is being done to learn more about a new medication called ‘VX-445’ when taken in combination with tezacaftor and ivacaftor. All three of these medications are known as CFTR modulators. CFTR modulators work to treat the underlying genetic cause of cystic fibrosis. This combination of medication is being assessed in people with Cystic Fibrosis who are 12 years and older and who are heterozygous for the F508del mutation and a gating or residual function mutation. The study will investigate how well these medications work and to check that they are safe to use. It is the hope that this combination of medications will have positive effects in some people with Cystic Fibrosis Participants will be asked to come into the clinic at the recruitment centre 9 times over a 5 month period where a study assessment will take place (blood tests, questionnaires, lung function etc.).