• Monday, March 1, 2021 @ 7:00 am

Santhera Pharmaceuticals (SIX: SANN) announces positive results from its multiple ascending dose Phase 1b study with lonodelestat, a potent inhibitor of human neutrophil elastase (hNE), in patients with cystic fibrosis (CF).

Lonodelestat is a potent and selective peptide inhibitor of human neutrophil elastase (hNE), currently being developed in cystic fibrosis (CF). Neutrophil elastase is an enzyme associated with tissue inflammation, leading to degradation of the lung tissue in cystic fibrosis and several other pulmonary diseases. Data from previous Phase 1a studies demonstrated that single dose inhalation of lonodelestat can lead to high drug concentrations within sputum, resulting in effective hNE inhibition [1, 2].

The double-blind, placebo-controlled dose-escalation Phase 1b study in patients with CF assessed the safety, tolerability, pharmacokinetics and pharmacodynamics of orally inhaled multiple daily doses of lonodelestat for up to four weeks (clinicaltrials.gov id: NCT03748199). In addition, the study investigated proof of mechanism of lonodelestat by measuring activity of hNE, an inflammatory biomarker for monitoring of disease progression in CF. Santhera acknowledges the support of the Cystic Fibrosis Foundation (CFF) by providing funding for the conduct of the Phase 1a and 1b safety trials with lonodelestat.

A total of 32 patients were randomized in four cohorts of eight patients each and received lonodelestat starting with 80 mg once daily (QD), 80 mg twice daily (BID), 160 mg QD, each administered for 15 days, followed by a last cohort with 40 mg QD administered for 28 days which was chosen after observing an effect on forced expiratory volume in 1 second (FEV1) in some patients treated with the highest doses (80 mg BID and 160 mg QD). In all four cohorts and over all treatment durations, lonodelestat demonstrated a good tolerability and no serious side effects (SAEs or AEs Grade 3 or higher) were reported by the patients. Results showed a linear dose-exposure relationship over the dose range from 40 mg to 160 mg, with no accumulation in plasma or sputum. In all cohorts, a transient, near complete inhibition of elastase activity was observed after inhalation. In addition, in some patients in the 40 mg QD cohort, a constant level of near complete inhibition gradually developed over the 28 days of drug inhalation. The results from the safety analyses and the confirmed effect on the hNE biomarker by lonodelestat are very encouraging for further development in CF and other inflammatory lung diseases and have established a safe dose regimen. The findings from this study will be taken into account in the design of future studies.

“This study provides promising data on the safety of lonodelestat and its potential to inhibit elastase in cystic fibrosis and maybe other chronic inflammatory conditions of the lung where neutrophils play a prominent role in the disease process,” said Marcus Mall, MD, Professor and Head of Department of Pediatric Respiratory Medicine, Immunology and Critical Care Medicine at the Charité-Universitätsmedizin Berlin. “The landscape of treatment options for patients with cystic fibrosis has changed in the recent years with the approval of new drugs, but there is still a medical need for drugs like lonodelestat that counteract the chronic inflammation and degradation of lung tissue which contributes to pulmonary exacerbations. Lonodelestat may add a new treatment modality for CF patients and I am very excited about the future development of lonodelestat and the next study.”

“We are very much encouraged by the trial results which support the hypothesis that lonodelestat may possess properties to counteract underlying inflammatory processes and which indicate treatment was well tolerated in patients with CF. This demonstrates for the first time that complete inhibition of neutrophil elastase can be achieved over a prolonged treatment duration by local delivery through inhalation. We would like to thank the patients, the investigators and their study teams for their participation in this study,” said Dario Eklund, CEO of Santhera. “After additional analyses of the results, we will be optimizing the further clinical development program to advance lonodelestat for the treatment of CF. In parallel, we are proactively pursuing collaborations with partners to assess and exploit the potential of lonodelestat in other pulmonary diseases.”

About lonodelestat
Lonodelestat (previously known as POL6014), a highly potent and selective peptide inhibitor of human neutrophil elastase (hNE), is in development for the treatment of cystic fibrosis. Santhera obtained the worldwide, exclusive rights from Polyphor AG to develop and commercialize lonodelestat in CF and other diseases. In preclinical studies lonodelestat was effective in animal models of neutrophil activation in lung tissue and of acute lung injury (ALI) [1, 2]. Currently available clinical data demonstrated that single and multiple doses (Phase 1b) of lonodelestat when administered by inhalation via an optimized eFlow® nebulizer (PARI Pharma GmbH) can lead to high drug concentrations within the lung, resulting in inhibition of hNE in sputum of patients, an enzyme associated with lung tissue inflammation [3]. The Phase 1b study further confirmed the tolerability of lonodelestat after treatment of up to four weeks in patients with CF. Lonodelestat may also show therapeutic benefit for a range of neutrophilic pulmonary diseases with high medical need such as non-CF bronchiectasis (NCFB), alpha-1 antitrypsin deficiency (AATD), chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS) or primary ciliary dyskinesia (PCD). Lonodelestat has EU orphan drug designations (ODD) for the treatment of CF as well as for AATD and PCD in both EU and US.


[1] Sellier Kessler O et al. Effect of POL6014, a potent and selective inhaled neutrophil elastase inhibitor, in a rat model of lung neutrophil activation. Am J Respir Crit Care Med 2018; 197: A2988

[2] Lagente V et al. A novel protein epitope mimetic (PEM) neutrophil elastase (NE) inhibitor, POL6014, inhibits human NE-Induced acute lung injury in mice. Am J Respir Crit Care Med 2009; 179: A5668

[3] Barth P et al. Single dose escalation studies with inhaled POL6014, a potent novel selective reversible inhibitor of human neutrophil elastase, in healthy volunteers and subjects with cystic fibrosis. J Cyst Fibros 2020; 19: 299-304

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