Cystic Fibrosis Transmembrane Regulator (CFTR) Biomarker Study to Evaluate the Rescue of Mutant CFTR in Patients With Cystic Fibrosis Treated With CFTR-modulators (Modulate-CF)

This observational study evaluates the effect of therapy with cystic fibrosis transmembrane regulator (CFTR) modulators on CFTR function measured by the CFTR biomarker intestinal current measurement (ICM), nasal potential difference (NPD) and sweat chloride in a post-approval setting in patients with cystic fibrosis (CF).