What the trial was testing
The trial enrolled 225 patients with cystic fibrosis. The study was sponsored by Vertex Pharmaceuticals and tracked outcomes across the full group of patients who matched the trial's eligibility profile.
It was an early-stage trial — researchers are still confirming safety and getting an early look at how well the treatment works. Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.
What the results showed
Lung function jumped 13.8 percentage points in people with one hard-to-treat mutation.
New England Journal of Medicine · 2018 · NCT03227471
These findings — that improvement in lung function (FEV1) for people with one Phe508del and a minimal-function mutation — were published in the New England Journal of Medicine and represent the headline result of the study.
Researchers tracked outcomes across 225 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.
What this means for patients
For patients with cystic fibrosis, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.
What you can do now
Elexacaftor-tezacaftor-ivacaftor (Trikafta) is FDA-approved and available now for people 2 and older with cystic fibrosis who carry at least one Phe508del mutation — about 90% of patients. Most U.S. CF centers prescribe it as standard care. Ask your CF team if your specific mutation qualifies.
Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.
Open cystic fibrosis trials
Circadian Rhythm Disorders in Children With Cystic Fibrosis Under CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) Modulators
Cystic fibrosis (CF) is a rare disease affecting one out of 4,500 newborns in France (INSERM 2021). Despite major advances in patient care over the past two decades, with significant improvements in life expectancy, cystic fibrosis remains a pathology that considerably impairs quality of life. Several studies have reported the possibility of respiratory and non-respiratory sleep disorders (SD) in patients with CF. Respiratory disorders are reported to affect 30% of children with CF (Barbosa 2020). Among non-respiratory SD, sleep onset and maintenance insomnia are well known in these patients, while chronotype abnormalities (circadian rhythm disorders) are understudied. Chronotype refers to a person's tendency to be more efficient in the morning or evening. The existence of chronotype abnormalities has been suggested in CF patients, but no precise data are available (Louis 2022). The involvement of CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) protein dysfunction in the central nervous system (CNS) has been hypothesized as a contributory factor. In vivo, in a mouse model of CF, dysregulation of clock genes such as Clock, Cry2 and Per2 was found in the CNS (Barbato 2019). Among them, certain genes such as Rev-erbα could regulate endobronchial inflammation and contribute to the severity of respiratory pathology. All in all, chronotype abnormalities could be at the origin of sleep debt, impaired cognitive functions or metabolic disturbances. In the era of highly effective modulator therapy (HEMT) for the treatment of CF, the impact of these new therapies on chronotype has been understudied. Assuming that chronotype abnormalities are a direct consequence of CFTR protein dysfunction in the retina and anterior hypothalamus, HEMT should improve sleep quality. However, between 20% and 30% of adult and pediatric patients express an increase in chronotype abnormalities following initiation of treatment. Paradoxically, the perceived gain in respiratory quality of life is counterbalanced by the occurrence of these disorders. Some patients would effectively reverse their treatment in order to limit the phenomenon. A single polysomnographic study evaluated the effect of HEMT Kaftrio-Kalydeco on sleep in adults with CF (Welsner 2022). After 3 months of treatment, patients had a significant reduction in respiratory events, with no change in total sleep time, sleep efficiency or sleep architecture. Chronotype was not mentioned. Currently, no studies on chronotype in children or adults with CF have been carried out. Our hypothesis is that CF patients treated with HEMT would develop an abnormal chronotype of late sleep onset. The aim of this study is to evaluate the chronotype of children with CF treated with HEMT. Chronotype abnormalities could have major consequences for quality of life, the immune system, cognitive functions and metabolism. Systematic detection of these disorders via anamnesis, followed by diagnosis by questionnaire, actimetrics and/or urinary melatonin dosage, would enable their early management, starting with the reversal of Kaftrio-Kalydeco intake between morning and evening.
Patienthèque of Finisterian (South of Brittany) Children With Cystic Fibrosis in the Time of Precision Medicine
The objective of this study is to evaluate the relevance of Porphyromonas as a biomarker predicting the risk of P. aeruginosa primocolonization in children form 0 to 18 years old with cystic fibrosis.