Why Pfizer (PFE) Is Buying ReViral For Up To $525 Million

By Amit Chowdhry ● Apr 7, 2022
  • Pfizer Inc. (NYSE: PFE) is buying ReViral for up to $525 million. This is why.

Pfizer Inc. (NYSE: PFE) and ReViral Ltd. announced today that the companies entered into a definitive agreement under which Pfizer will acquire ReViral, a privately held, clinical-stage biopharmaceutical company focused on discovering, developing, and commercializing novel antiviral therapeutics that target respiratory syncytial virus (RSV).

RSV is known as a respiratory pathogen, which can lead to severe and life-threatening lower respiratory tract infections (LRTIs) in high-risk populations, including young infants, immunocompromised individuals, and older adults. And it is estimated to cause infections in approximately 64 million people, resulting in about 160,000 deaths, globally each year.

ReViral has a portfolio of promising therapeutic candidates, including sisunatovir, an orally administered inhibitor designed to block the fusion of the RSV virus to the host cell. And sisunatovir significantly reduced viral load in a phase 2 RSV human challenge study in healthy adults and is currently in phase 2 clinical development in infants. 

The development program for sisunatovir is expected to continue in both adult and pediatric populations. A second program is focused on the inhibition of RSV replication targeting the viral N protein. The lead candidate in this program is currently in phase 1 clinical development.

Sisunatovir was granted Fast Track designation by the U.S. Food and Drug Administration (FDA). And in June 2021, ReViral announced the successful completion of Part A of the phase 2 REVIRAL1 study of sisunatovir for the treatment of RSV infections in hospitalized infants. REVIRAL1 is a global three-part adaptive study to evaluate the safety, tolerability, pharmacokinetic (PK) profile, antiviral effects, and clinical effect of single and multiple oral doses of sisunatovir in otherwise healthy infants between the ages of 1 and 36 months hospitalized with RSV LRTIs. 

Following a review by the REVIRAL1 Data Safety Monitoring Committee, sisunatovir showed a favorable safety and PK exposure profile to advance to Part B, the double-blind, placebo-controlled stage of the study where patients receive drug or placebo twice a day for 5 days.

Under the terms of the deal, Pfizer will acquire ReViral for a total consideration of up to $525 million, including upfront and development milestones. And if successful, Pfizer believes annual revenue for these programs has the potential to reach or exceed $1.5 billion. The proposed transaction is subject to customary closing conditions, including receipt of regulatory approvals.

KEY QUOTES:

“At Pfizer, we have a strong heritage in, and commitment to, fighting infectious diseases, most recently evidenced by our delivery of the first authorized vaccine and oral therapy to combat COVID-19. We’re continuing to grow our pipeline – through our own research-and-development efforts, such as our investigational RSV vaccine programs, as well as strategic investments in companies like ReViral – with a focus on end-to-end capabilities to help protect patients from severe illness, hospitalization, and death.”

— Albert Bourla, Chairman and Chief Executive Officer, Pfizer

“Currently, treatment options for RSV are extremely limited and focus primarily on supportive care. The proposed acquisition of ReViral’s pipeline of therapeutic candidates is complementary to our efforts to advance the first vaccine candidate to help protect against this harmful disease. Combining the capabilities and expertise of our organizations will enable us to further the clinical development of a potential therapy for those with RSV disease.”

— Annaliesa Anderson, Ph.D., Senior Vice President and Chief Scientific Officer, Bacterial Vaccines and Hospital, at Pfizer

“Since the foundation of the company a decade ago by Dr. Ken Powell and Dr. Stuart Cockerill, ReViral’s mission has always been to develop world-class therapies for RSV patients. This acquisition represents a validation of the deep antiviral experience of the ReViral team and our unwavering commitment to deliver therapies for patients in need. Pfizer is an optimal partner given their commitment to RSV through their ongoing RSV vaccine program, coupled with their world-class clinical, regulatory, manufacturing and commercial capabilities. We look forward to working with our colleagues at Pfizer to bring these therapies to patients as quickly as possible.”

— Alex Sapir, CEO, ReViral