Impact of Discontinuing Hypertonic Saline in People With CF on Highly Effective CFTR Modulators- A SIMPLIFY Sub-Study — SIMPLIFY-HS  

Cystic Fibrosis Clinical Trial

Official title: A Master Protocol to Test the Impact of Discontinuing Chronic Therapies in People With Cystic Fibrosis on Highly Effective CFTR Modulator Therapy - Hypertonic Saline

Status Completed

Clinical Trial Summary

Despite the increasingly common use of cystic fibrosis transmembrane conductance regulator (CFTR) modulator therapies in treating cystic fibrosis (CF), it is still largely unknown whether or not other chronic therapies can be safely stopped. This SIMPLIFY sub-study is being done to test whether or not it is safe to stop taking inhaled hypertonic saline in those people that are also taking elexacaftor/tezacaftor/ivacaftor (ETI).

ETI is a combination CFTR modulator therapy that was approved by the Food and Drug Administration for people with CF who have at least one F508del mutation. The three drugs that make up ETI work together to allow many more chloride ions to move into and out of the cells, improving the balance of salt and water in the lungs. These changes result in better clearance of mucus from the lungs and improvements in lung function.

Inhaled hypertonic saline (HS) also improves clearance of mucus from the lungs to support lung function and has been available to people with CF for many years. HS is considered to be relatively burdensome and it is not known whether HS can improve or maintain lung function above what is already gained through ETI use.

The goal of this SIMPLIFY sub-study is to get information about whether or not it is safe to stop hypertonic saline by testing if there is a change in lung function in participants with cystic fibrosis (CF) who are assigned to stop taking HS as compared to those who are assigned to keep taking HS while continuing to take ETI.

This is a sub study of master protocol SIMPLIFY-IP-19, NCT04378153.

The sub study investigating the impact of discontinuing and continuing dornase alfa is registered under NCTXXXXXXX (will add once available).

Clinical Trial Description

This SIMPLIFY sub-study (Hypertonic Saline (HS) Trial) is designed to evaluate the effects of discontinuing HS in people with cystic fibrosis (CF) age 12 and older currently taking the highly effective modulator elexacaftor/tezacaftor/ivacaftor (ETI). This is an open label two-arm randomized non-inferiority trial consisting of a 2-week screening period, randomization to continue or discontinue hypertonic saline, followed by a 6-week study period. Participants at trial entry will be randomized 1:1 to either continue or discontinue their HS therapy.

Clinical outcomes (forced expiratory volume in 1 second [FEV1], antibiotic use, pulmonary exacerbations, and patient reported outcomes), safety (adverse events) and patient reported outcomes to evaluate respiratory symptoms and the participant's perception of how stopping HS would impact their daily life will be evaluated in all subjects. Additionally, a subset of participants at selected study sites will participate in Multiple Breath Washout (MBW) to evaluate changes in lung clearance index (LCI). ;

Related Conditions & MeSH terms

• Cystic Fibrosis
• Fibrosis

• NCT number: NCT06350461
• Study type: Interventional
• Source: Seattle Children's Hospital
• Status: Completed
• Phase: N/A
• Start date: August 25, 2020
• Completion date: July 11, 2022