Vir Biotechnology Announces Topline Data from Phase 2 PENINSULA Trial Evaluating VIR-2482 for the Prevention of Seasonal Influenza A Illness

SAN FRANCISCO, CA, USA I July 20, 2023 I Vir Biotechnology, Inc. (Nasdaq: VIR) today announced that the Phase 2 PENINSULA (PrevEntioN of IllNesS DUe to InfLuenza A) trial evaluating VIR-2482 for the prevention of symptomatic influenza A illness did not meet primary or secondary efficacy endpoints. In participants who received the highest dose of VIR-2482 (1,200 mg), a non-statistically significant reduction of approximately 16% in influenza A protocol-defined illness was observed. Participants who received the highest dose showed an approximately 57% reduction in symptomatic influenza A illness, when defined according to CDC influenza-like-illness criteria, which was one of two secondary endpoints. VIR-2482 was generally well tolerated and no safety signals were identified.

PENINSULA (NCT05567783) is the first Phase 2 outpatient trial to evaluate the role of a monoclonal antibody in the prevention of influenza A illness. The dose-ranging, proof-of-concept trial enrolled approximately 3,000 men and women ages 18 to 64 without risk factors for serious complications from an influenza infection who did not receive an influenza vaccination for the flu season. The primary efficacy endpoint was the proportion of trial participants with protocol-defined influenza-like-illness1 with PCR-confirmed influenza A infection compared to placebo. Secondary endpoints included the proportion of participants with CDC-defined influenza-like-illness2 with PCR-confirmed influenza A infection and the proportion of participants with WHO-defined influenza-like-illness3 with PCR-confirmed influenza A infection.

“Although, these topline data are disappointing, further analysis is necessary to better understand these outcomes, which we plan to present at a major medical congress,” said Phil Pang, M.D., Ph.D., Vir’s Executive Vice President, Chief Medical Officer and Interim Head of Research. “In the meantime, we are continuing to advance next generation solutions for serious respiratory infections, including VIR-2981, an investigational neuraminidase-targeting monoclonal antibody against both influenza A and B viruses.”

“We are grateful to all who participated in this trial, and we remain committed to the pursuit of novel therapies that have the potential to address some of the world’s most serious infectious diseases,” said Marianne De Backer, M.Sc., Ph.D., MBA, Vir’s Chief Executive Officer. “I’m very excited about the future ahead, with the opportunities that we have, including a robust pipeline, where we expect two data readouts across our hepatitis B and hepatitis D programs in 2023. We also have a strong balance sheet with approximately $1.9 billion in cash and investments, as of the end of the second quarter, which will allow us to invest in our ongoing development and future innovation.”

The Company plans to host a Second Quarter 2023 Results conference call on Thursday, Aug. 3, during which these results will be discussed.

Efficacy Analyses
Occurrence of Influenza-Like-Illness (ILI) with PCR-Confirmed Influenza A

  # of Participants with
VIR-2482 vs. Placebo

N = 983
n (%)

450 mg
N = 981
n (%)
1,200 mg
N = 992
n (%)
Number of Participants
Protocol-Defined ILI1
25 (2.54%) 24 (2.45%) 21 (2.12%)
Relative Risk Reduction (%) - 3.78% 15.85%
95% CI (%) - -67.23, 44.63 -49.27, 52.56
p-value - 0.89 0.56
Number of Participants with
CDC-Defined ILI2
17 (1.73%) 15 (1.53%) 7 (0.71%)
Relative Risk Reduction (%) - 11.45% 57.23%
95% CI (%) - -76.25, 55.51 -2.51, 82.15
Number of Participants with
WHO-Defined ILI3
11 (1.12%) 12 (1.22%) 6 (0.60%)
Relative Risk Reduction (%) - -9.80% 44.13%
95% CI (%) - -147.41, 51.27 -50.49, 79.26

Note: Percentages are calculated relative to the number of participants in the full analysis set.
1 Protocol-defined ILI is defined as PCR-confirmed influenza A infection with at least one respiratory symptom: sore throat, cough, sputum production, wheezing, or difficulty breathing and at least one systemic symptom: fever (temperature >37.8°C), chills, weakness, or myalgias.
2 CDC-ILI is defined as fever (temperature >37.8°C) and cough and/or sore throat.
3 WHO-ILI is defined as fever (temperature >38°C) and cough.

The PENINSULA trial has been supported in whole or in part with federal funds from the Department of Health and Human Services; Administration for Strategic Preparedness and Response (ASPR); Biomedical Advanced Research and Development Authority (BARDA), under Other Transaction Number: 75A50122C00081.

About VIR-2482
VIR-2482 is an investigational hemagglutinin targeting, intramuscularly administered influenza A-neutralizing monoclonal antibody. In vitro, it has been shown to cover all major strains of influenza A that have arisen since the 1918 flu pandemic. VIR-2482 is designed as a prophylactic for influenza A. It has the potential to address the limitations of current flu vaccines due to its broad strain coverage and because it does not rely on an individual to create their own protective antibody response. VIR-2482, which incorporates Xencor’s Xtend™ technology, also has been half-life engineered so that a single dose has the potential to last the entire flu season. Under the collaboration agreement signed with GSK in 2021, GSK has an exclusive option to lead post-Phase 2 development and commercialization of VIR-2482.

About VIR-2981
VIR-2981 is an investigational neuraminidase-targeting monoclonal antibody against influenza viruses. It targets a region of the neuraminidase protein that is highly conserved across influenza A and B strains and is designed to inhibit the influenza neuraminidase, a key viral protein that facilitates release of new viruses in infected individuals. Preclinical data demonstrate the antibody’s breadth and potency against all major strains of seasonal and pandemic influenza viruses and support the potential of this antibody in the prevention of influenza illness.

About Vir Biotechnology
Vir Biotechnology is a commercial-stage immunology company focused on combining immunologic insights with cutting-edge technologies to treat and prevent serious infectious diseases. Vir has assembled four technology platforms that are designed to stimulate and enhance the immune system by exploiting critical observations of natural immune processes. Its current development pipeline consists of product candidates targeting hepatitis B and D viruses, influenza A, human immunodeficiency virus and COVID-19. Vir routinely posts information that may be important to investors on its website.

SOURCE: Vir Biotechnology

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