The phase 2 Covid-19 study included 92 patients. The intended inclusion criteria were patients diagnosed with Covid-19 who exhibited moderate symptoms (having difficulty breathing, signs of pneumonia, potentially requiring oxygen but not requiring mechanical ventilation). The patients were randomized to three arms, Rabeximod 15 mg o.d (n=30), 30 mg o.d (n=30) or placebo (n=32) and constituting two types of patients (with and without oxygen therapy), receiving treatment in an inpatient and outpatient fashion. The treatment period was 14 days, the endpoint 28 days and all patients were followed up for 60 days.

The primary endpoint in the study was to assess the proportion of subjects alive and free of respiratory failure (need for invasive mechanical ventilation, non-invasive ventilation, high-flow nasal cannula oxygen, or ECMO) at day 28 for the three arms. The study objective was to determine if there is a difference in the proportions of subjects that can be categorized as "alive and free of respiratory failure" in the different treatment arms in comparison to placebo (standard of care treatment such as dexamethasone). The U.S. Food and Drug Administration (FDA) has performed a pre-review of the statistical analysis plan prior to data unblinding.

The top line data analysis showed that 100% of the patients in the 30 mg arm were "alive and free of respiratory failure" 28 days following start of treatment. The corresponding proportions of patients in the 15 mg arm and in the placebo arms were 97% and 97%, respectively. The difference between the treatment arms and the placebo group were not statistically significant. Further, the study data concludes that treatment with Rabeximod did not increase the risk to develop more severe disease.

As a next step, Cyxone will explore the secondary and exploratory endpoints in detail to gain further insights into the therapeutic effect of the drug candidate in Covid-19 and Rabeximod's mode of action. These analyses will guide further strategic decisions concerning the next step for the program.

The company will also now intensify its efforts on evaluating the drug candidate in patients with rheumatoid arthritis and is currently preparing the initiation of a phase 2b study in this indication.

" The top-line data from our study of Rabeximod in Covid-19 patients did not provide us with conclusive findings. Our current data analysis indicate that almost all patients received a treatment effect, however no statistically significant differences could be observed between the treatment groups and those who received placebo. We will now look further into the data to see if we can capture signals that are able to discriminate the groups better. Again, we can conclude that Rabeximod is safe and well tolerated in patients and does not increase the risk of developing severe disease," explained Carl-Magnus Högerkorp, COO, Cyxone.

"As we continuously learn more about the virus and the disease we will be able to establish more precise treatments in the future, and given the great need for better treatments to combat the Covid-19 pandemic, our extended analysis of secondary endpoints will guide us on whether further development of Rabeximod is warranted in this indication. Nevertheless, the results reinforce the beneficial safety and tolerability profile of our drug candidate in infected and ill patients. We will now intensify our preparations for the upcoming phase 2b study of Rabeximod in patients with rheumatoid arthritis, where we look forward to start this program in 2022," commented Tara Heitner, CEO, Cyxone.

Contact

Tara Heitner, CEO
Tel: +46 70 781 88 08
Email: tara.heitner@cyxone.com
Adelgatan 21
211 22 Malmö, Sweden

This information is information that Cyxone AB (publ) is required to make public pursuant to the EU's Market Abuse Regulation. The information was submitted for publication by the contact person above on December 6, 2021, at 08.45 a.m. CET.

About Cyxone

Cyxone AB (publ) (Nasdaq First North Growth Market: CYXO) develops disease modifying therapies for diseases such as rheumatoid arthritis and multiple sclerosis as well as treatments for virally induced acute respiratory disorders. Rabeximod is a Phase 2 candidate drug being evaluated for the management of rheumatoid arthritis and moderate Covid-19 infections. T20K is a Phase 1 candidate drug for treatment of multiple sclerosis. Certified Adviser is FNCA Sweden AB, +46(0)8-528 00 399, info@fnca.se.For more information, please visit www.cyxone.com