Senicapoc in Patients With Worsening Fibrotic Interstitial Lung Disease

Background: Fibrosing interstitial lung disease (F-ILD) represents a heterogeneous group of chronic, severely debilitating, and ultimately lethal lung diseases with limited treatment options. The common denominator for F-ILD is similarities regarding development of scarring of the lungs. Two antifibrotic treatments (pirfenidone, nintedanib), have shown to improve progression free survival, and slowed the decline in forced ventilatory capacity (FVC). These treatments are currently approved in the European Union and are standard of care for many patients. But both treatments have a lot of unbeneficial side-effects, making it unbearable for many patients to receive full dose treatment and often patients progress despite antifibrotic treatment.

Senicapoc is a selective and highly potent inhibitor of KCa3.1 channels. The KCa3.1 channel is pivotal in Ca+ signaling and plays a central role in fibroblast processes. It is therefore thought to play an important role in the development of many fibrotic diseases, including lung fibrosis. Two lines of evidence using human lung cells and lung slices indicate that blocking of the KCa3.1 channel attenuates many profibrotic activities and support the expected antifibrotic effect of senicapoc. In sheep studies, senicapoc has shown not only to attenuate disease progression but also signs of reversing the disease. It has been extensively tested in animal studies and shown no toxic or unbeneficial effects, and it has been tested in human studies in healthy volunteers, patients with sickle cell disease, asthma, and COVID-19, without revealing any serious adverse reactions.

Aims, Objectives and hypothesis: The aim of this study is to investigate the effect of senicapoc in preventing progression in F-ILD. Evaluation will consist of spirometry, 6-minute walking distance test and diffusion capacity. Sidewise changes in quality of life and degree of dyspnea will be obtained. Clinical examinations and bloodtests will be done to evaluate a second aim of this study; the safety of senicapoc in IPF patients.

The hypothesis is that senicapoc is safe, without any major adverse reactions, and has a valuable effect in preventing progression in fibrotic ILD.

Patients diagnosed with fibrotic ILD and shown to progress despite standard of care are candidates. Patients must have an F-ILD diagnosis within 5 years, and an HRCT scan within the previous 24 months. In addition to this, patients must have shown disease progression within the last year, and with no more additional antifibrotic treatment options available. Patients will be recruited from the outpatient clinic. A total of 140 participants will be included, distributed between 6 different sites.

Intervention: Participants will be randomly assigned to one of two groups to receive either senicapoc 30mg/day or placebo in addition to their usual antifibrotic treatment, if any. The tablets containing the active ingredient will have a dosage of 10 mg each, while the placebo tablets are manufactured to resemble the active ingredient tablets in terms of size, color, and design. Participants will be examined at initiation, after 4, 13 and 26 weeks of study drug intake. In addition blood test will be drawn at 0, 4 and 26 weeks. The main trial endpoint is rate of decline of FVC (in mL) over a period of 26 weeks. A final observation will be caried out at week 52, including blood safety assesment.