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NeuroRx and Relief Therapeutics Announce Fast Track Designation Granted by the FDA to RLF-100 (Aviptadil) for the Treatment of Respiratory Distress in COVID-19

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NeuroRx, Inc., in partnership with RELIEF THERAPEUTICS Holding AG (SIX:RLF) “Relief” today announced that the U.S. Food and Drug Administration (FDA) awarded Fast Track designation to NeuroRx for the investigation of RLF-100 (Aviptadil) for the treatment of acute lung injury/acute respiratory distress syndrome associated with COVID-19. RLF-100 is a synthetic form of human Vasoactive Intestinal Peptide (VIP) which reduces inflammation in the lungs and protects the alveolar type II cells that are believed to be an entry route for the SARS-CoV-2 to invade the lungs.

As part of NeuroRx's enrollment in the Fast Track program, the FDA has requested that NeuroRx submit a publicly-available expanded access policy, so that physicians may request RLF-100 for their patients who are being treated in hospitals not participating in the ongoing Phase 2/3 clinical trials.

We at NeuroRx are enormously appreciative of the FDA's commitment to accelerating the development of any potential treatment for COVID-19. We hope to live up to the trust that has been placed in us by bringing a life-saving treatment to patients,” said Prof. Jonathan Javitt, MD, MPH, CEO and Chairman of NeuroRx.

This milestone demonstrates the effectiveness of the FDA CoronaVirus Treatment Acceleration Program and the FDA's achievement in rising up to address the most severe public health crisis of our lifetime,” said former FDA Chief Counsel, Daniel Troy, a member of the Company's board of directors.

RLF-100 is being tested in Phase 2/3 clinical trials at major medical centers including the University of Miami, Houston Methodist Hospital, University of California-Irvine, the NYU Langone Medical Center, and the Rambam Healthcare Campus (Haifa, Israel). The multicenter clinical trial enrolls patients with Critical COVID-19 and respiratory failure in the hopes that RLF-100 can decrease mortality and improve blood oxygenation in this condition by rescuing alveolar type II cells from the SARS-CoV-2 virus.

Details of the study are posted on clinicaltrials.gov NCT04311697.

About RLF-100

RLF-100 (Aviptadil) is a patented formulation of Vasoactive Intestinal Polypeptide (VIP) that was developed based on Dr. Said's original work and was originally approved for human trials by the FDA in 2001 and the European Medicines Agency in 2005. VIP is primarily concentrated in the lung and is known to protect against a variety of lung injuries. VIP was awarded Orphan Drug Designation in 2001 by the U.S. FDA for treatment of Acute Respiratory Distress Syndrome and in 2005 for treatment of Pulmonary Arterial Hypertension. The European Medicines Agency awarded orphan drug designation in 2006 for the treatment of acute lung injury and in 2007 for the treatment of sarcoidosis.

About VIP in Lung Injury

Vasoactive Intestinal Polypeptide (VIP) was first discovered by the late Dr. Sami Said in 1970. Although first identified in the intestinal tract, VIP is now known to be produced throughout the body and to be primarily concentrated in the lungs. VIP has been shown in more than 100 peer-reviewed studies to have potent anti-inflammatory/anti-cytokine activity in animal models of respiratory distress, acute lung injury, and inflammation. Most importantly, 70% of the VIP in the body is bound to a rare cell in the lung, the alveolar type II cell, that is critical to transmission of oxygen to the body. VIP has a 20-year history of safe use in humans in multiple human trials for sarcoidosis, pulmonary fibrosis, asthma/allergy, and pulmonary hypertension.

COVID-19-related death is primarily caused by Respiratory Failure. Before this acute phase, however, there is evidence of early viral infection of the alveolar type II cells. These cells are known to have angiotensin converting enzyme 2 (ACE2) receptors at high levels, which serve as the route of entry for the SARS-CoV-2 into the cells. Corona Viruses are shown to replicate in alveolar type II cells, but not in the more numerous type 1 cells. These same alveolar type II cells have high concentrations of VIP receptors on their cell surfaces giving rise to the hypothesis that VIP could specifically protect these cells from injury.

Injury to the alveolar type II cells is an increasingly plausible mechanism of COVID-19 disease progression. (Mason 2020). These specialized cells replenish the more common type 1 cells that line the lungs. More importantly, type 2 cells manufacture surfactant that coats the lung and are essential for oxygen exchange. Other than RLF-100, no currently proposed treatments for COVID-19 specifically target these vulnerable type 2 cells.

About RELIEF THERAPEUTICS Holding AG

The Relief group of companies focus primarily on clinical-stage projects based on molecules of natural origin (peptides and proteins) with a history of clinical testing and use in human patients or a strong scientific rationale. Currently, Relief is concentrating its efforts on developing new treatments for respiratory disease indications.

RELIEF THERAPEUTICS Holding AG is listed on the SIX Swiss Exchange under the symbol RLF.

About NeuroRx, Inc.

NeuroRx draws upon more than 100 years of collective drug development experience and is led by former senior executives of Johnson & Johnson, Eli Lilly, Pfizer, and AstraZeneca, PPD. In addition to its work on RLF-100, NeuroRx has been awarded Breakthrough Therapy Designation and a Special Protocol Agreement to develop NRX- 101 for the treatment of suicidal bipolar depression and is currently in Phase 3 trials.

Disclaimer: This communication expressly or implicitly contains certain forward-looking statements concerning RELIEF THERAPEUTICS Holding AG, NeuroRx, Inc. and their businesses. Such statements involve certain known and unknown risks, uncertainties and other factors, which could cause the actual results, financial condition, performance or achievements of RELIEF THERAPEUTICS Holding AG and/or NeuroRx, Inc. to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. RELIEF THERAPEUTICS Holding AG is providing this communication as of this date and does not undertake to update any forward-looking statements contained herein as a result of new information, future events or otherwise.

Contact information

CORPORATE CONTACTS
Jonathan C. Javitt, M.D., MPH
Chief Executive Officer
NeuroRx, Inc.
ceo@neurorxpharma.com

Yves Sagot, Ph.D.
Relief Therapeutics Holding, SA
yves.sagot@relieftherapeutics.com

MEDIA CONTACT
Gloria Gasaatura
LifeSci Communications
ggasaatura@lifescicomms.com
646-970-4688

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