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AstraZeneca’s PROVENT trial met primary endpoint

Mene Pangalos

AZD7442, a combination of two long-acting antibodies (LAAB), reduced the risk of developing symptomatic COVID-19 by 77%, compared to placebo.

The Phase III trial accrued 25 cases of symptomatic COVID-19 at the primary analysis. There were no cases of severe COVID-19 or COVID-19-related deaths in those treated with AZD7442. In the placebo arm, there were three cases of severe COVID-19, which included two deaths.

“We need additional approaches for individuals who are not adequately protected by COVID-19 vaccines. We are very encouraged by these efficacy and safety data in high-risk people, showing our long-acting antibody combination has the potential to protect from symptomatic and severe disease, alongside vaccines. We look forward to sharing further data from the AZD7442 Phase III clinical trial programme later this year,” says Mene Pangalos, Executive Vice President, BioPharmaceuticals R&D, AstraZeneca.


AZD7442 is the first antibody combination (non-vaccine) modified to potentially provide long-lasting protection that has demonstrated prevention of COVID-19 in a clinical trial. The trial included 5,197 participants in a 2:1 randomization AZD7442 to placebo. The primary analysis was based on 5,172 participants who did not have SARS-CoV-2 infection at baseline. More than 75% of participants had co-morbidities, which include conditions that have been reported to cause a reduced immune response to vaccination.

The LAAB was well tolerated and preliminary analyses show adverse events were balanced between the placebo and AZD7442 groups.

AZD7442 was optimised using AstraZeneca’s YTE half-life extension technology, which could afford up to 12 months of protection from COVID-19, and is delivered by intramuscular injection.

Preliminary ‘in vitro’ findings from investigators at Oxford University and Columbia University demonstrate that AZD7442 neutralises recent emergent SARS-CoV-2 viral variants, including the Delta variant.

AstraZeneca will prepare regulatory submission of the prophylaxis (PROVENT and STORM CHASER) data to health authorities for potential emergency use authorisation or conditional approval of AZD7442.

Photo of Mene Pangalos: AstraZeneca